parallel/test-fastutf8stream-flush-mocks and parallel/test-fastutf8stream-sync are flaky on Windows

From https://github.com/nodejs/reliability/blob/main/reports/2025-08-26.md

| Reason | <code>parallel/test-fastutf8stream-flush-mocks</code> |
| - | :- |
| Type | JS_TEST_FAILURE |
| Failed PR | 14 ([https://github.com/nodejs/node/pull/59567/](https://ci.nodejs.org/job/node-test-pull-request/68781/), [https://github.com/nodejs/node/pull/59570/](https://ci.nodejs.org/job/node-test-pull-request/68804/), [https://github.com/nodejs/node/pull/59571/](https://ci.nodejs.org/job/node-test-pull-request/68807/), [https://github.com/nodejs/node/pull/59350/](https://ci.nodejs.org/job/node-test-pull-request/68809/), [https://github.com/nodejs/node/pull/59527/](https://ci.nodejs.org/job/node-test-pull-request/68817/), [https://github.com/nodejs/node/pull/59579/](https://ci.nodejs.org/job/node-test-pull-request/68824/), [https://github.com/nodejs/node/pull/59595/](https://ci.nodejs.org/job/node-test-pull-request/68838/), [https://github.com/nodejs/node/pull/58155/](https://ci.nodejs.org/job/node-test-pull-request/68839/), [https://github.com/nodejs/node/pull/58680/](https://ci.nodejs.org/job/node-test-pull-request/68847/), [https://github.com/nodejs/node/pull/59601/](https://ci.nodejs.org/job/node-test-pull-request/68849/), [https://github.com/nodejs/node/pull/58797/](https://ci.nodejs.org/job/node-test-pull-request/68851/), [https://github.com/nodejs/node/pull/59576/](https://ci.nodejs.org/job/node-test-pull-request/68856/), [https://github.com/nodejs/node/pull/59179/](https://ci.nodejs.org/job/node-test-pull-request/68866/), [https://github.com/nodejs/node/pull/59603/](https://ci.nodejs.org/job/node-test-pull-request/68867/)) |
| Appeared | [test-rackspace-win2016_vs2015-x64-1](https://ci.nodejs.org/job/node-test-binary-windows-js-suites/RUN_SUBSET=1,nodes=win2016-COMPILED_BY-vs2022-x86/36509/console), [test-rackspace-win2016_vs2015-x64-2](https://ci.nodejs.org/job/node-test-binary-windows-js-suites/RUN_SUBSET=2,nodes=win2016-COMPILED_BY-vs2022-x86/36452/console), [test-azure_msft-win2016_vs2017-x64-1](https://ci.nodejs.org/job/node-test-binary-windows-js-suites/RUN_SUBSET=1,nodes=win2016-COMPILED_BY-vs2022-x86/36439/console) |
| First CI | https://ci.nodejs.org/job/node-test-pull-request/68781/ |
| Last CI | https://ci.nodejs.org/job/node-test-pull-request/68867/ |

<details>
<summary><a href="https://ci.nodejs.org/job/node-test-binary-windows-js-suites/RUN_SUBSET=1,nodes=win2016-COMPILED_BY-vs2022-x86/36509/console">Example</a></summary>

```
not ok 319 parallel/test-fastutf8stream-flush-mocks
  ---
  duration_ms: 928.99500
  severity: fail
  exitcode: 1
  stack: |-
    Can't clean tmpdir: C:\workspace\node-test-binary-windows-js-suites\node\test\.tmp.302
    Files blocking: [
      'fastutf8stream-2252-1756150137626-0.log',
      'fastutf8stream-2252-1756150137632-2.log'
    ]
    
    C:\workspace\node-test-binary-windows-js-suites\node\test\common\tmpdir.js:80
        throw e;
        ^
    
    Error: ENOTEMPTY: directory not empty, rmdir 'C:\workspace\node-test-binary-windows-js-suites\node\test\.tmp.302'
        at Object.rmdirSync (node:fs:1206:11)
        at _rmdirSync (node:internal/fs/rimraf:261:21)
        at rimrafSync (node:internal/fs/rimraf:194:7)
        at Object.rmSync (node:fs:1252:10)
        at rmSync (C:\workspace\node-test-binary-windows-js-suites\node\test\common\tmpdir.js:31:8)
        at onexit (C:\workspace\node-test-binary-windows-js-suites\node\test\common\tmpdir.js:65:5)
        at process.<anonymous> (C:\workspace\no...
```
</details>

-------

| Reason | <code>parallel/test-fastutf8stream-sync</code> |
| - | :- |
| Type | JS_TEST_FAILURE |
| Failed PR | 14 ([https://github.com/nodejs/node/pull/59567/](https://ci.nodejs.org/job/node-test-pull-request/68781/), [https://github.com/nodejs/node/pull/59570/](https://ci.nodejs.org/job/node-test-pull-request/68804/), [https://github.com/nodejs/node/pull/59571/](https://ci.nodejs.org/job/node-test-pull-request/68807/), [https://github.com/nodejs/node/pull/59350/](https://ci.nodejs.org/job/node-test-pull-request/68809/), [https://github.com/nodejs/node/pull/59527/](https://ci.nodejs.org/job/node-test-pull-request/68817/), [https://github.com/nodejs/node/pull/59579/](https://ci.nodejs.org/job/node-test-pull-request/68824/), [https://github.com/nodejs/node/pull/59595/](https://ci.nodejs.org/job/node-test-pull-request/68838/), [https://github.com/nodejs/node/pull/58155/](https://ci.nodejs.org/job/node-test-pull-request/68839/), [https://github.com/nodejs/node/pull/58680/](https://ci.nodejs.org/job/node-test-pull-request/68847/), [https://github.com/nodejs/node/pull/59601/](https://ci.nodejs.org/job/node-test-pull-request/68849/), [https://github.com/nodejs/node/pull/58797/](https://ci.nodejs.org/job/node-test-pull-request/68851/), [https://github.com/nodejs/node/pull/59576/](https://ci.nodejs.org/job/node-test-pull-request/68856/), [https://github.com/nodejs/node/pull/59179/](https://ci.nodejs.org/job/node-test-pull-request/68866/), [https://github.com/nodejs/node/pull/59603/](https://ci.nodejs.org/job/node-test-pull-request/68867/)) |
| Appeared | [test-rackspace-win2016_vs2015-x64-2](https://ci.nodejs.org/job/node-test-binary-windows-js-suites/RUN_SUBSET=2,nodes=win2016-COMPILED_BY-vs2022-x86/36509/console), [test-azure_msft-win2016_vs2017-x64-2](https://ci.nodejs.org/job/node-test-binary-windows-js-suites/RUN_SUBSET=3,nodes=win2016-COMPILED_BY-vs2022-x86/36452/console) |
| First CI | https://ci.nodejs.org/job/node-test-pull-request/68781/ |
| Last CI | https://ci.nodejs.org/job/node-test-pull-request/68867/ |

<details>
<summary><a href="https://ci.nodejs.org/job/node-test-binary-windows-js-suites/RUN_SUBSET=2,nodes=win2016-COMPILED_BY-vs2022-x86/36509/console">Example</a></summary>

```
not ok 314 parallel/test-fastutf8stream-sync
  ---
  duration_ms: 1050.01600
  severity: fail
  exitcode: 1
  stack: |-
    Can't clean tmpdir: C:\workspace\node-test-binary-windows-js-suites\node\test\.tmp.304
    Files blocking: [
      'fastutf8stream-4936-1756150148470-2.log',
      'fastutf8stream-4936-1756150148534-7.log'
    ]
    
    C:\workspace\node-test-binary-windows-js-suites\node\test\common\tmpdir.js:80
        throw e;
        ^
    
    Error: ENOTEMPTY: directory not empty, rmdir 'C:\workspace\node-test-binary-windows-js-suites\node\test\.tmp.304'
        at Object.rmdirSync (node:fs:1206:11)
        at _rmdirSync (node:internal/fs/rimraf:261:21)
        at rimrafSync (node:internal/fs/rimraf:194:7)
        at Object.rmSync (node:fs:1252:10)
        at rmSync (C:\workspace\node-test-binary-windows-js-suites\node\test\common\tmpdir.js:31:8)
        at onexit (C:\workspace\node-test-binary-windows-js-suites\node\test\common\tmpdir.js:65:5)
        at process.<anonymous> (C:\workspace\node-tes...
```
</details>

These tests were introduced in https://github.com/nodejs/node/pull/58897

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parallel/test-fastutf8stream-flush-mocks and parallel/test-fastutf8stream-sync are flaky on Windows #59638

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Reason	`parallel/test-fastutf8stream-flush-mocks`
Type	JS_TEST_FAILURE
Failed PR	14 (https://github.com/nodejs/node/pull/59567/, https://github.com/nodejs/node/pull/59570/, https://github.com/nodejs/node/pull/59571/, https://github.com/nodejs/node/pull/59350/, https://github.com/nodejs/node/pull/59527/, https://github.com/nodejs/node/pull/59579/, https://github.com/nodejs/node/pull/59595/, https://github.com/nodejs/node/pull/58155/, https://github.com/nodejs/node/pull/58680/, https://github.com/nodejs/node/pull/59601/, https://github.com/nodejs/node/pull/58797/, https://github.com/nodejs/node/pull/59576/, https://github.com/nodejs/node/pull/59179/, https://github.com/nodejs/node/pull/59603/)
Appeared	test-rackspace-win2016_vs2015-x64-1, test-rackspace-win2016_vs2015-x64-2, test-azure_msft-win2016_vs2017-x64-1
First CI	https://ci.nodejs.org/job/node-test-pull-request/68781/
Last CI	https://ci.nodejs.org/job/node-test-pull-request/68867/

Uh oh!

parallel/test-fastutf8stream-flush-mocks and parallel/test-fastutf8stream-sync are flaky on Windows #59638

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