[eslint-bulk] Fix caching during eslintrc lookup

[dmichon-msft]

Summary

Fixes an issue where a number of results of probing for .eslintrc.cjs and .eslintrc.js files weren't being cached.

Details

In a folder structure like:

src/
 a/
  1/
 b/
  c/
  d/

Searching for the .eslintrc.cjs file from a/1/ wrote cache records for src/, src/a/, and src/a/1/. However, a subsequent lookup in src/b/c/ would find the cache record for src/, but not write cache records to src/b/ or src/b/c/, resulting in duplicative searches for all subsequent files in these folders.

How it was tested

Under fstrace to observe the disk probes.

Impacted documentation

None. This is the expected behavior.