[WIP] Live Collab M3 - Proofreading (without segments list)

[philippotto]

URL of deployed dev instance (used for testing):

• https://___.webknossos.xyz

Steps to test:

• abc

TODOs:

• prototype with mutex acquisition within proofread saga (we don't want this in the long run for various reasons, though)
• implement ad-hoc mutex acuisition in save process
• implement ensureNewestVersion mechanism to avoid conflicts during saving
• ensure eager mutex acquisition still works for non-proofreading annotations (e.g. state.save.needsMutex boolean which the sagas act on)
• avoid "read-only" flickering in navbar
  • refactor mayEdit state in store?
• ensure that update action reconciliation is only done for proofreading actions
• make the new late-mutex approach opt-in (beta flag in sharing modal?)
  • disable all other tools if activated
  • disable segment list editing?
• how to deal with outdated meshes?
• write tests
• clean up
• ensure backend does accept split update actions when supervoxels are already split and merge update actions when supervoxels are already merged

Issues:

• fixes Milestone 3: Proofreading (without segment list) #8724

---

(Please delete unneeded items, merge only when none are left open)

• Added changelog entry (create a $PR_NUMBER.md file in unreleased_changes or use ./tools/create-changelog-entry.py)
• Added migration guide entry if applicable (edit the same file as for the changelog)
• Updated documentation if applicable
• Adapted wk-libs python client if relevant API parts change
• Removed dev-only changes like prints and application.conf edits
• Considered common edge cases
• Needs datastore update after deployment

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[fm3]

since we’re not using any info from the findOne other than whether to delete, we could merge the two into one query and just DELETE WHERE annotationId = a AND userId = u