test(detectors): Move fetchMock reset to afterEach

- Align `cron.spec.tsx` with `serviceIncidents.spec.tsx` by moving `fetchMock.resetMocks()` to `afterEach`.

Author: jaydgoss

static/app/views/detectors/list/cron.spec.tsx

@@ -30,12 +30,15 @@ describe('CronDetectorsList', () => {
     },
   };
 
+  afterEach(() => {
+    fetchMock.resetMocks();
+  });
+
   beforeEach(() => {
     ConfigStore.set('statuspage', {
       id: 'sentry',
       api_host: 'status.sentry.io',
     });
-    fetchMock.resetMocks();
     MockApiClient.clearMockResponses();
     MockApiClient.addMockResponse({
       url: '/organizations/org-slug/users/1/',