[Infra] Improved GitHub Issue Link Formatting in Release Notes

[rlazo]

Enhances the MakeReleaseNotesTask to provide more structured and readable GitHub issue links in the generated release notes.

Key Changes:

• Parenthetical Enclosure: Updated githubIssueLinkFormatter to wrap generated links in parentheses.
• Multi-Issue Support: Introduced githubMultiIssueLinkFormatter to detect and format comma-separated lists of GitHub issues. Multiple issues are now presented as an indented list within parentheses.
• Automatic Line Positioning: Added logic to automatically move GitHub links to a new, indented line if they are preceded by other content, preventing them from being appended directly to the end of a sentence.
• Updated Regex Logic: Refined existing regex and added new patterns to accurately identify single and multiple issue references and their context.
• Verified with Tests: Updated test resources in plugins/src/test/resources to reflect the new formatting style and added cases for multiple issue links.

Internal b/491979526

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[github-actions]

plugins test results

67 tests   67 ✅  1m 55s ⏱️
12 suites   0 💤
12 files     0 ❌

Results for commit 6732ec0.

♻️ This comment has been updated with latest results.