feat: add CodeRabbit release gate workflow and prompt for PR audits

[MonaaEid]

Description:
This PR introduces a new automated release audit workflow for release pull requests, focused on ensuring architectural integrity and identifying breaking changes before a new version is published. The workflow posts a standardized senior-level audit prompt as a comment on qualifying release PRs, guiding reviewers to perform a comprehensive review.

• Added a new GitHub Actions workflow (release-pr-coderabbit-gate.yml) that triggers on release PRs and posts a CodeRabbit audit prompt comment, ensuring every release PR is subject to a structured senior-level review.
• Implemented the supporting script (release-pr-coderabbit-gate.js) to post a deduplicated, permission-gated audit comment only on maintainer-authored release PRs, embedding the audit prompt and instructions.

Fixes #1709

Checklist

• Created release-pr-prompt.md, release-pr-coderabbit-gate.yml and release-pr-coderabbit-gate.js
• Documented
• Tested

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@           Coverage Diff           @@
##             main    #2049   +/-   ##
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  Coverage   93.68%   93.68%           
=======================================
  Files         144      144           
  Lines        9350     9350           
=======================================
  Hits         8760     8760           
  Misses        590      590           

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