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/tar-stream/sandbox.js

@@ -0,0 +1,11 @@
+const tar = require('tar-stream')
+const fs = require('fs')
+const path = require('path')
+const pipeline = require('pump') // eequire('stream').pipeline
+
+fs.createReadStream('test.tar')
+  .pipe(tar.extract())
+  .on('entry', function (header, stream, done) {
+    console.log(header.name)
+    pipeline(stream, fs.createWriteStream(path.join('/tmp', header.name)), done)
+  })