Switch to new collaborators component (#1405)

Followup to https://github.com/tldraw/brivate/pull/1584

- Removes the old collaborators component, replacing with the new one.
- Removes the associated debug flag

### Change Type

<!-- 💡 Indicate the type of change your pull request is. -->
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- [ ] `patch` — Bug Fix
- [ ] `minor` — New Feature
- [x] `major` — Breaking Change
- [ ] `dependencies` — Dependency Update (publishes a `patch` release,
for devDependencies use `internal`)
- [ ] `documentation` — Changes to the documentation only (will not
publish a new version)
- [ ] `tests` — Changes to any testing-related code only (will not
publish a new version)
- [ ] `internal` — Any other changes that don't affect the published
package (will not publish a new version)

### Test Plan

Check that multiplayer presence UI renders correctly

- cursors
- cursor hints (when a peer's cursor goes off the screen)
- selection brush box
- selection/erasing brush
- selected shape(s) outline

### Release Notes

- [Breaking] Removes the old version of LiveCollaborators, replacing it
with the new one based on `TLInstancePresence`

packages/editor/src/lib/components/Canvas.tsx

@@ -17,7 +17,6 @@ import { useQuickReactor } from '../hooks/useQuickReactor'
 import { useScreenBounds } from '../hooks/useScreenBounds'
 import { debugFlags } from '../utils/debug-flags'
 import { LiveCollaborators } from './LiveCollaborators'
-import { LiveCollaboratorsNext } from './LiveCollaboratorsNext'
 import { SelectionBg } from './SelectionBg'
 import { SelectionFg } from './SelectionFg'
 import { Shape } from './Shape'
@@ -128,11 +127,7 @@ export const Canvas = track(function Canvas({
 					<HintedShapeIndicator />
 					<SnapLinesWrapper />
 					<SelectionFg />
-					{debugFlags.newLiveCollaborators.value ? (
-						<LiveCollaboratorsNext />
-					) : (
-						<LiveCollaborators />
-					)}
+					<LiveCollaborators />
 				</div>
 			</div>
 		</div>