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/y-leveldb/dist/tests/index.d.ts

@@ -0,0 +1,2 @@
+export {};
+//# sourceMappingURL=index.d.ts.map

node_modules/y-leveldb/dist/tests/index.d.ts.map

@@ -0,0 +1 @@
+{"version":3,"file":"index.d.ts","sourceRoot":"","sources":["../../tests/index.js"],"names":[],"mappings":""}

node_modules/y-leveldb/dist/tests/y-leveldb.tests.d.ts

@@ -0,0 +1,8 @@
+export function testLeveldbUpdateStorage(tc: t.TestCase): Promise<void>;
+export function testEncodeManyUpdates(tc: t.TestCase): Promise<void>;
+export function testDiff(tc: t.TestCase): Promise<void>;
+export function testMetas(tc: t.TestCase): Promise<void>;
+export function testDeleteEmptySv(tc: t.TestCase): Promise<void>;
+export function testMisc(tc: any): Promise<void>;
+import * as t from "lib0/testing";
+//# sourceMappingURL=y-leveldb.tests.d.ts.map

node_modules/y-leveldb/dist/tests/y-leveldb.tests.d.ts.map

@@ -0,0 +1 @@
+{"version":3,"file":"y-leveldb.tests.d.ts","sourceRoot":"","sources":["../../tests/y-leveldb.tests.js"],"names":[],"mappings":"AAmDO,6CAFI,CAAC,CAAC,QAAQ,iBAyCpB;AAKM,0CAFI,CAAC,CAAC,QAAQ,iBAgDpB;AAKM,6BAFI,CAAC,CAAC,QAAQ,iBAuCpB;AAKM,8BAFI,CAAC,CAAC,QAAQ,iBA0BpB;AAKM,sCAFI,CAAC,CAAC,QAAQ,iBAsBpB;AAEM,iDASN"}