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-protocols/auth.js

@@ -0,0 +1,33 @@
+
+import * as Y from 'yjs' // eslint-disable-line
+import * as encoding from 'lib0/encoding'
+import * as decoding from 'lib0/decoding'
+
+export const messagePermissionDenied = 0
+
+/**
+ * @param {encoding.Encoder} encoder
+ * @param {string} reason
+ */
+export const writePermissionDenied = (encoder, reason) => {
+  encoding.writeVarUint(encoder, messagePermissionDenied)
+  encoding.writeVarString(encoder, reason)
+}
+
+/**
+ * @callback PermissionDeniedHandler
+ * @param {any} y
+ * @param {string} reason
+ */
+
+/**
+ *
+ * @param {decoding.Decoder} decoder
+ * @param {Y.Doc} y
+ * @param {PermissionDeniedHandler} permissionDeniedHandler
+ */
+export const readAuthMessage = (decoder, y, permissionDeniedHandler) => {
+  switch (decoding.readVarUint(decoder)) {
+    case messagePermissionDenied: permissionDeniedHandler(y, decoding.readVarString(decoder))
+  }
+}