Clean up threat monitoring alerts code

- remove unnecessary testing waits
- rename variable to be more readable

app/assets/javascripts/vue_shared/alert_details/components/sidebar/sidebar_status.vue

@@ -62,11 +62,11 @@ export default {
         dropdown.show();
       }
     },
-    handleUpdating(updating) {
-      if (!updating) {
+    handleUpdating(isMutationInProgress) {
+      if (!isMutationInProgress) {
         this.$emit('alert-update');
       }
-      this.isUpdating = updating;
+      this.isUpdating = isMutationInProgress;
     },
   },
 };

ee/spec/frontend/threat_monitoring/components/alerts/alert_drawer_spec.js

@@ -167,7 +167,6 @@ describe('Alert Drawer', () => {
     createWrapper({ props: { selectedAlert: mockAlerts[0] } });
     expect(wrapper.emitted('alert-update')).toBeUndefined();
     findStatus().vm.$emit('alert-update');
-    await wrapper.vm.$nextTick();
     expect(wrapper.emitted('alert-update')).toEqual([[]]);
   });
 });

spec/frontend/vue_shared/alert_details/sidebar/alert_sidebar_status_spec.js

@@ -125,7 +125,6 @@ describe('Alert Details Sidebar Status', () => {
         mountComponent({ sidebarCollapsed: false });
         expect(wrapper.emitted('alert-update')).toBeUndefined();
         findAlertStatus().vm.$emit('handle-updating');
-        await wrapper.vm.$nextTick();
         expect(wrapper.emitted('alert-update')).toEqual([[]]);
       });