[Backport 2.19] Guard eclipse() to spotless tasks and keep P2 mirror on pinned version (common-utils)

[peterzhuamazon]

Backport 846658a from #1004.

[github-actions]

PR Code Analyzer ❗

AI-powered 'Code-Diff-Analyzer' found issues on commit fc46755.

⛔ Hard block: Issues at High severity or above will block this PR from merging.

Path	Line	Severity	Description
build.gradle	28	high	Dependency version change: com.diffplug.spotless:spotless-plugin-gradle bumped from 6.22.0 to 8.10.1. Per mandatory supply-chain rule, all dependency version changes must be flagged regardless of apparent legitimacy. Maintainers should verify the artifact hash and changelog before merging.
build.gradle	139	medium	Eclipse JDT formatter is now explicitly pinned to version 4.27 and resolved through the P2 mirror at https://ci.opensearch.org/ (substituting https://download.eclipse.org/). The mirror was present before this diff, but the new explicit version pin anchors artifact resolution to a specific build served by a third-party CI host rather than the canonical Eclipse P2 site. Maintainers should confirm that ci.opensearch.org is a controlled, trusted mirror and that the 4.27 artifact it serves matches the canonical Eclipse release.

The table above displays the top 10 most important findings.

Total: 2 | Critical: 0 | High: 1 | Medium: 1 | Low: 0

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Pull Requests Author(s): Please update your Pull Request according to the report above.

Repository Maintainer(s): You can bypass diff analyzer by adding label skip-diff-analyzer after reviewing the changes carefully, then re-run failed actions. To re-enable the analyzer, remove the label, then re-run all actions.

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[github-actions]

PR Reviewer Guide 🔍

(Review updated until commit 479d839)

Here are some key observations to aid the review process:

🧪 No relevant tests

🔒 No security concerns identified

✅ No TODO sections

🔀 No multiple PR themes

⚡ No major issues detected

[github-actions]

Persistent review updated to latest commit 479d839

[github-actions]

Persistent review updated to latest commit 479d839

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (2.19@1592e99). Learn more about missing BASE report.

Additional details and impacted files

@@           Coverage Diff           @@
##             2.19    #1008   +/-   ##
=======================================
  Coverage        ?   70.56%           
  Complexity      ?     1032           
=======================================
  Files           ?      162           
  Lines           ?     7135           
  Branches        ?      810           
=======================================
  Hits            ?     5035           
  Misses          ?     1766           
  Partials        ?      334           

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