[FLASK] Add snap update metrics (#15206)

* added snap update metrics

* fixed update event

app/scripts/metamask-controller.js

@@ -1291,6 +1291,21 @@ export default class MetamaskController extends EventEmitter {
       },
     );
 
+    this.controllerMessenger.subscribe(
+      `${this.snapController.name}:snapUpdated`,
+      (newSnap, oldVersion) => {
+        this.metaMetricsController.trackEvent({
+          event: 'Snap Updated',
+          category: EVENT.CATEGORIES.SNAPS,
+          properties: {
+            snap_id: newSnap.id,
+            old_version: oldVersion,
+            new_version: newSnap.version,
+          },
+        });
+      },
+    );
+
     this.controllerMessenger.subscribe(
       `${this.snapController.name}:snapTerminated`,
       (truncatedSnap) => {