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/fast-stable-stringify/fixtures/log-result.json

@@ -0,0 +1,22 @@
+{
+  "nickyout/fast-stable-stringify": {
+    "chrome 26": {
+      "Windows 2008": {
+        "opsPerSec": 6.025,
+        "percentage": 6.76,
+        "numSamples": 50,
+        "cumStrLength": 94425969
+      }
+    }
+  },
+  "substack/json-stable-stringify": {
+    "chrome 26": {
+      "Windows 2008": {
+        "opsPerSec": 4.114,
+        "percentage": 1.05,
+        "numSamples": 50,
+        "cumStrLength": 61301724
+      }
+    }
+  }
+}