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/tunnel-agent/package.json

@@ -0,0 +1,22 @@
+{
+  "author": "Mikeal Rogers <mikeal.rogers@gmail.com> (http://www.futurealoof.com)",
+  "name": "tunnel-agent",
+  "license": "Apache-2.0",
+  "description": "HTTP proxy tunneling agent. Formerly part of mikeal/request, now a standalone module.",
+  "version": "0.6.0",
+  "repository": {
+    "url": "https://github.com/mikeal/tunnel-agent"
+  },
+  "main": "index.js",
+  "files": [
+    "index.js"
+  ],
+  "dependencies": {
+    "safe-buffer": "^5.0.1"
+  },
+  "devDependencies": {},
+  "optionalDependencies": {},
+  "engines": {
+    "node": "*"
+  }
+}