[WIP/NeedsFrontend] Annotation merging: allow specifying if segment ids should be remapped

[fm3]

URL of deployed dev instance (used for testing):

• https://___.webknossos.xyz

Steps to test:

• abc

TODOs:

• Backend
  • Offer the parameter
  • Propagate the paramter to MergedVolume
  • Do not build id maps in this case
• Frontend
  • Checkbox in UI (only if non-empty volume layers exist?)
  • Always set to false in case of volume layers with fallback segmentation layer?
• Discussion
  • What should be the default for upload multiple? For import volume data?

Issues:

• fixes Merging volume annotations: allow specifying if ids should be remapped #9496

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(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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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch merge-volume-remap-optional

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