FRE-600: Fix code review blockers

- Consolidated duplicate UndoManagers to single instance
- Fixed connection promise to only resolve on 'connected' status
- Fixed WebSocketProvider import (WebsocketProvider)
- Added proper doc.destroy() cleanup
- Renamed isPresenceInitialized property to avoid conflict

Co-Authored-By: Paperclip <noreply@paperclip.ing>

node_modules/lib0/delta/delta.test.d.ts

@@ -0,0 +1,29 @@
+export function testDeltaBasicApi(_tc: t.TestCase): void;
+export function testDeltaValues(_tc: t.TestCase): void;
+export function testDeltaBasicCases(): void;
+export function testDeltaArrayBasics(): void;
+export function testAssignability(): void;
+export function testText(): void;
+export function testDelta(_tc: t.TestCase): void;
+export function testDeltaMerging(_tc: t.TestCase): void;
+export function testUseAttributes(_tc: t.TestCase): void;
+export function testUseAttribution(_tc: t.TestCase): void;
+export function testMapTyping(): void;
+export function testMapDeltaBasics(_tc: t.TestCase): void;
+export function testMapDeltaModify(_tc: t.TestCase): void;
+export function testMapDelta(_tc: t.TestCase): void;
+export function testRepeatRebaseMergeDeltas(tc: t.TestCase): void;
+export function testNodeDelta(_tc: t.TestCase): void;
+export function testRecursiveNode(): void;
+export function testSimplifiedDeltaSchemaDefinition(): void;
+export function testDiffing(): void;
+export function testDiffingCommonPreSuffix(): void;
+export function testSlice(): void;
+export function testRepeatRandomListDiff(tc: t.TestCase): void;
+export function testRepeatRandomMapDiff(tc: t.TestCase): void;
+export function testDeltaAppend(_tc: t.TestCase): void;
+export function testDeltaDiffWithFormatting(): void;
+export function testDeltaDiffWithFormatting2(): void;
+export function testDeltaDiffIssue1(): void;
+import * as t from 'lib0/testing';
+//# sourceMappingURL=delta.test.d.ts.map