Remove to archetype & archetype queries

[Wumpf]

What

This removes a fair bit of generated code that we use in too few places to justify the overhead!

commit by commit review recommended: Each commit removes a use of latest_at_archetype (or similar), the last then removes the then freed up ToArchetype machinery.

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!

• PR Build Summary
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