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/preact/compat/src/memo.js

@@ -0,0 +1,34 @@
+import { createElement } from 'preact';
+import { shallowDiffers } from './util';
+
+/**
+ * Memoize a component, so that it only updates when the props actually have
+ * changed. This was previously known as `React.pure`.
+ * @param {import('./internal').FunctionComponent} c functional component
+ * @param {(prev: object, next: object) => boolean} [comparer] Custom equality function
+ * @returns {import('./internal').FunctionComponent}
+ */
+export function memo(c, comparer) {
+	function shouldUpdate(nextProps) {
+		let ref = this.props.ref;
+		let updateRef = ref == nextProps.ref;
+		if (!updateRef && ref) {
+			ref.call ? ref(null) : (ref.current = null);
+		}
+
+		if (!comparer) {
+			return shallowDiffers(this.props, nextProps);
+		}
+
+		return !comparer(this.props, nextProps) || !updateRef;
+	}
+
+	function Memoed(props) {
+		this.shouldComponentUpdate = shouldUpdate;
+		return createElement(c, props);
+	}
+	Memoed.displayName = 'Memo(' + (c.displayName || c.name) + ')';
+	Memoed.prototype.isReactComponent = true;
+	Memoed._forwarded = true;
+	return Memoed;
+}