[MM-57066][MM-57329] Added metrics for all notification stopping points, consolidated categories between metrics and logging (#26799)

* [MM-57066] Add metric counters for notification events

* Some small changes

* Account for Metrics() sometimes being nil

* Fix test (again)

* Fix more tests

* A few changes from testing - added success counter

* Missed a mock

* Lint

* Add feature flag for notification monitoring

webapp/platform/client/src/websocket.ts

@@ -412,11 +412,11 @@ export default class WebSocketClient {
         this.sendMessage('user_update_active_status', data, callback);
     }
 
-    acknowledgePostedNotification(postId: string, result: 'error' | 'not_sent' | 'unsupported' | 'success', reason?: string, postedData?: string) {
+    acknowledgePostedNotification(postId: string, status: string, reason?: string, postedData?: string) {
         const data = {
             post_id: postId,
             user_agent: window.navigator.userAgent,
-            result,
+            status,
             reason,
             data: postedData,
         };