[Backport 3.0] Update Gradle wrapper and startup scripts (to 8.14 baseline)

[opensearch-trigger-bot]

Backport 1b48dbd from #18090.

[github-actions]

❌ Gradle check result for b5c0f48: 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 b5c0f48: 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 b5c0f48: 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 b5c0f48: 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 b5c0f48: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.53%. Comparing base (e0272e0) to head (b5c0f48).
Report is 11 commits behind head on 3.0.

Additional details and impacted files

@@             Coverage Diff              @@
##                3.0   #18105      +/-   ##
============================================
- Coverage     72.58%   72.53%   -0.05%     
- Complexity    67139    67181      +42     
============================================
  Files          5478     5480       +2     
  Lines        310120   310314     +194     
  Branches      45080    45138      +58     
============================================
+ Hits         225092   225100       +8     
- Misses        66684    66804     +120     
- Partials      18344    18410      +66     

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