📝 remove package tags from changelog entries

[BenoitZugmeyer]

Motivation

Changelog entries currently include package scope tags like [RUM], [LOGS], or [WORKER] on many lines.
Those tags add visual noise and make release notes harder to scan quickly for user-facing changes.

This change simplifies changelog output so entries stay focused on what changed.

Changes

• stop appending package scope tags to generated changelog entries
• simplify changelog generation by removing affected-package computation from this flow
• remove the now-unused getAffectedPackages helper

Test instructions

1. Run the changelog generation flow for the current release process.
2. Open CHANGELOG.md and verify newly generated entries do not include trailing package tags (for example [RUM], [LOGS], [WORKER]).
3. Confirm links/emojis/section ordering in generated entries remain unchanged.

Checklist

• Tested locally
• Tested on staging
• Added unit tests for this change.
• Added e2e/integration tests for this change.
• Updated documentation and/or relevant AGENTS.md file

[datadog-datadog-prod-us1]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 76.56% (+0.00%)

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 56bef6a | Docs | Datadog PR Page | Give us feedback!}

[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	175.36 KiB	175.36 KiB	0 B	0.00%	✅
Rum Profiler	8.08 KiB	8.08 KiB	0 B	0.00%	✅
Rum Recorder	21.23 KiB	21.23 KiB	0 B	0.00%	✅
Logs	57.01 KiB	57.01 KiB	0 B	0.00%	✅
Rum Slim	132.97 KiB	132.97 KiB	0 B	0.00%	✅
Worker	22.99 KiB	22.99 KiB	0 B	0.00%	✅

🔗 RealWorld