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/error-stack-parser/error-stack-parser.d.ts

@@ -0,0 +1,19 @@
+// Type definitions for ErrorStackParser v2.1.0
+// Project: https://github.com/stacktracejs/error-stack-parser
+// Definitions by: Eric Wendelin <https://www.eriwen.com>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+import StackFrame = require("stackframe");
+
+declare namespace ErrorStackParser {
+    export type {StackFrame};
+    /**
+     * Given an Error object, extract the most information from it.
+     *
+     * @param {Error} error object
+     * @return {Array} of StackFrames
+     */
+    export function parse(error: Error): StackFrame[];
+}
+
+export = ErrorStackParser;