Removed now unused Rotation3D component & datatype

[Wumpf]

What

• Part of Split Transform3D component union type into components #6831
• Builds on top of Use LeafTranslation (centers), LeafRotationQuat and LeafRotationAxisAngle directly on Boxes3D/Ellipsoids3D #7029

Porting considerations handled by previous PRs

Checklist

• I have read and agree to Contributor Guide and the Code of Conduct
• I've included a screenshot or gif (if applicable)
• I have tested the web demo (if applicable):
  • Using examples from latest main build: rerun.io/viewer
  • Using full set of examples from nightly build: rerun.io/viewer
• The PR title and labels are set such as to maximize their usefulness for the next release's CHANGELOG
• If applicable, add a new check to the release checklist!
• If have noted any breaking changes to the log API in CHANGELOG.md and the migration guide

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[github-actions]

Deployed docs

Commit	Link
4e2399a	https://landing-hsztxvwtk-rerun.vercel.app/docs