Remove use entities

[kmcginnes]

Description

The hook useEntities() was used for nearly everything in the past. I have slowly been moving logic out of that hook, and the corresponding Recoil selector entitiesSelector, for the last 2 months. This is the final removal of the old code.

• Moved all entity adding logic to useAddToGraph()
  • Make sure schema is updated with any new types or attributes
  • Update import to use add to graph hook
• Moved all entity removal logic to useRemoveFromGraph()
  • Clean up any tangential state (selected entities, focused entities, etc)
• Remove useEntities()
  • Move all tests to new hooks
  • Remove entitiesSelector, nodesSelector, and edgesSelector
  • Fix filteredEdgesSelector to fix issue where node doesn't exist for an edge
• Use ConfigurationId as type for active connection

Validation

• Tested in all three query engines
• Tested adding and removing many entities
• Tested filtering, selection, and focus

Related Issues

• Fixes App crash during import when node doesn't exist for edge #787

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0
  license.
• I have run pnpm checks to ensure code compiles and meets standards.
• I have run pnpm test to check if all tests are passing.
• I have covered new added functionality with unit tests if necessary.
• I have added an entry in the Changelog.md.

[andreachild]

LGTM