ci: Add workflow to notify issues when fix is released

[antonis]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

Adds a GitHub Actions workflow that automatically comments on closed issues when the release containing their fix is published.

When a release is published, the release-comment-issues-gh-action parses PR links from the release notes, looks up which issues each PR closes (via GitHub closing keywords like Fixes #123), and posts a comment on those issues notifying users that the fix has been released.

Pre-release versions (alpha, beta, rc) are skipped. The workflow can also be triggered manually via workflow_dispatch.

Already used in sentry-javascript and being added to sentry-dart.

💡 Motivation and Context

Improves the experience for issue reporters — they get notified when a fix ships without anyone having to manually go back and comment.

💚 How did you test it?

Verified the release notes format matches the action's expected PR link pattern ([#1234](https://github.com/getsentry/sentry-react-native/pull/1234)). Can be further tested via workflow_dispatch after merge.

📝 Checklist

• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled
• I updated the docs if needed.
• I updated the wizard if needed.
• All tests passing
• No breaking changes

🔮 Next steps

[github-actions]

Semver Impact of This PR

⚪ None (no version bump detected)

📋 Changelog Preview

This is how your changes will appear in the changelog.
Entries from this PR are highlighted with a left border (blockquote style).

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• ci: Add workflow to notify issues when fix is released by antonis in #6089

• Fix PNPM iOS Upload Debug Symbol fail in EAS Build by alwx in #6086
• chore(deps): update Sentry Android Gradle Plugin to v6.6.0 by github-actions in #6085
• fix(e2e): Remove flaky iOS replay assertion from captureReplay test by antonis in #6072
• chore(deps): bump github/codeql-action from 4.35.2 to 4.35.3 by dependabot in #6078
• fix: Prevent shell injection vulnerability in GitHub Actions workflow by fix-it-felix-sentry in #6077
• chore(deps): update Maestro to v2.5.1 by github-actions in #6075

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_{🤖 This preview updates automatically when you update the PR.}

[github-actions]

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[lucas-zimerman]

LGTM!