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/core-js/internals/symbol-define-to-primitive.js

@@ -0,0 +1,21 @@
+'use strict';
+var call = require('../internals/function-call');
+var getBuiltIn = require('../internals/get-built-in');
+var wellKnownSymbol = require('../internals/well-known-symbol');
+var defineBuiltIn = require('../internals/define-built-in');
+
+module.exports = function () {
+  var Symbol = getBuiltIn('Symbol');
+  var SymbolPrototype = Symbol && Symbol.prototype;
+  var valueOf = SymbolPrototype && SymbolPrototype.valueOf;
+  var TO_PRIMITIVE = wellKnownSymbol('toPrimitive');
+
+  if (SymbolPrototype && !SymbolPrototype[TO_PRIMITIVE]) {
+    // `Symbol.prototype[@@toPrimitive]` method
+    // https://tc39.es/ecma262/#sec-symbol.prototype-@@toprimitive
+    // eslint-disable-next-line no-unused-vars -- required for .length
+    defineBuiltIn(SymbolPrototype, TO_PRIMITIVE, function (hint) {
+      return call(valueOf, this);
+    }, { arity: 1 });
+  }
+};