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/shebang-regex/index.d.ts

@@ -0,0 +1,22 @@
+/**
+Regular expression for matching a [shebang](https://en.wikipedia.org/wiki/Shebang_(Unix)) line.
+
+@example
+```
+import shebangRegex = require('shebang-regex');
+
+const string = '#!/usr/bin/env node\nconsole.log("unicorns");';
+
+shebangRegex.test(string);
+//=> true
+
+shebangRegex.exec(string)[0];
+//=> '#!/usr/bin/env node'
+
+shebangRegex.exec(string)[1];
+//=> '/usr/bin/env node'
+```
+*/
+declare const shebangRegex: RegExp;
+
+export = shebangRegex;