[Backport 2.x] Add @InternalApi annotation to japicmp exclusions

[opensearch-trigger-bot]

Backport 5c8623f from #14597.

[github-actions]

❌ Gradle check result for 36d9384: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❌ Gradle check result for 36d9384: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❕ Gradle check result for 36d9384: UNSTABLE

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.51%. Comparing base (70064e2) to head (36d9384).
Report is 6 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #14598      +/-   ##
============================================
+ Coverage     71.41%   71.51%   +0.10%     
- Complexity    62286    62376      +90     
============================================
  Files          5102     5102              
  Lines        293188   293230      +42     
  Branches      42718    42725       +7     
============================================
+ Hits         209372   209701     +329     
+ Misses        66198    65920     -278     
+ Partials      17618    17609       -9     

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