Update release notes for 12.1.0

[JeroenDeDauw]

Summary

• Add entries for all changes merged since 12.0.0 that were missing from the release notes
• Covers new features (marker-color, KML filename, cluster animation), compatibility (MW 1.45), and bug fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 57b8f127-d446-441e-8a9c-6c68c54bde05

📥 Commits

Reviewing files that changed from the base of the PR and between 2b2ddd8 and fb662c9.

📒 Files selected for processing (1)

• RELEASE-NOTES.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch update-release-notes-12.1.0

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