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/why-is-node-running/cli.js

@@ -0,0 +1,18 @@
+#!/usr/bin/env node
+
+var spawn = require('child_process').spawn
+var path = require('path')
+
+var prog = path.resolve(process.argv[2])
+var progArgs = process.argv.slice(3)
+
+console.log('probing program', prog)
+
+var nodeArgs = [
+  '-r',
+  path.join(__dirname, 'include.js')
+]
+var nodeOpts = { stdio: 'inherit' }
+var child = spawn('node', nodeArgs.concat(prog).concat(progArgs), nodeOpts)
+
+console.log('kill -SIGUSR1', child.pid, 'for logging')