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/schema.test.d.ts

@@ -0,0 +1,15 @@
+export function testSchemas(_tc: t.TestCase): void;
+export function testSchemaExpect(): void;
+export function testObjectSchemaOptionals(_tc: t.TestCase): void;
+export function testMetaSchemas(_tc: t.TestCase): void;
+export function testStringTemplate(_tc: t.TestCase): void;
+export function testSchemaExtends(_tc: t.TestCase): void;
+export function testSchemaErrors(_tc: t.TestCase): void;
+export function testUnionMerging(_tc: t.TestCase): void;
+export function testConvenienceHelper(): void;
+export function testPatternMatcherBase(): void;
+export function testPatternMatcherWithState(): void;
+export function testPatternMatcherBenchmark(): void;
+export function testRepeatRandomFromSchema(tc: t.TestCase): void;
+import * as t from './testing.js';
+//# sourceMappingURL=schema.test.d.ts.map