chore: [Not for review] removed GuardeBy

[suztomo]

As part of #1938. This pull request is an experiment to see the effect of the GuardedBy annotation.

[sonarcloud]

[gapic-generator-java-root] Kudos, SonarCloud Quality Gate passed!   

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[suztomo]

The Bazel build caught the bug!

https://github.com/googleapis/sdk-platform-java/actions/runs/6397756942/job/17366399303?pr=2060:

external/com_google_api_gax_java/gax-httpjson/src/main/java/com/google/api/gax/httpjson/HttpJsonClientCallImpl.java:287: error: [GuardedBy] This access should be guarded by 'this.lock', which is not currently held
        if (inDelivery && newActiveDeliveryLoop) {
            ^
    (see https://errorprone.info/bugpattern/GuardedBy)
external/com_google_api_gax_java/gax-httpjson/src/main/java/com/google/api/gax/httpjson/HttpJsonClientCallImpl.java:292: error: [GuardedBy] This access should be guarded by 'this.lock', which is not currently held
        inDelivery = true;
        ^
    (see https://errorprone.info/bugpattern/GuardedBy)

[sonarcloud]

[java_showcase_integration_tests] Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[sonarcloud]

[java_showcase_unit_tests] Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information