Add missing items to 0.19.0 changelog

[emilk]

What

• Closes Changelog generator seems to ignore changes between last patch & minor releases #7825

When generating the changelog, I accidentally wrote

scripts/generate_changelog.py --commit-range 0.18.2..HEAD

and should have done

scripts/generate_changelog.py --commit-range 0.18.0..HEAD

I've updated generate_changelog.py to make the same mistake impossible in the future.

I've already updated the GitHub release notes with the changes in this PR.

• Sibling PR: Improve generate_changelog.py rerun_template#17

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

• PR Build Summary
• Recent benchmark results
• Wasm size tracking

To run all checks from main, comment on the PR with @rerun-bot full-check.

[Wumpf]

nice, this should make this a lot easier in the future!