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/@eslint/eslintrc/universal.js

@@ -0,0 +1,9 @@
+// Jest (and probably some other runtimes with custom implementations of
+// `require`) doesn't support `exports` in `package.json`, so this file is here
+// to help them load this module. Note that it is also `.js` and not `.cjs` for
+// the same reason - `cjs` files requires to be loaded with an extension, but
+// since Jest doesn't respect `module` outside of ESM mode it still works in
+// this case (and the `require` in _this_ file does specify the extension).
+
+// eslint-disable-next-line no-undef
+module.exports = require("./dist/eslintrc-universal.cjs");