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/is-docker/readme.md

@@ -0,0 +1,27 @@
+# is-docker
+
+> Check if the process is running inside a Docker container
+
+## Install
+
+```
+$ npm install is-docker
+```
+
+## Usage
+
+```js
+const isDocker = require('is-docker');
+
+if (isDocker()) {
+	console.log('Running inside a Docker container');
+}
+```
+
+## CLI
+
+```
+$ is-docker
+```
+
+Exits with code 0 if inside a Docker container and 2 if not.