fix(scheduler): fix a data race in a scheduler unit test EE-2715 (#6628)

api/scheduler/scheduler_test.go

@@ -53,12 +53,15 @@ func Test_JobShouldStop_UponError(t *testing.T) {
 	defer s.Shutdown()
 
 	var acc int
+	ch := make(chan struct{})
 	s.StartJobEvery(jobInterval, func() error {
 		acc++
+		close(ch)
 		return fmt.Errorf("failed")
 	})
 
 	<-time.After(3 * jobInterval)
+	<-ch
 	assert.Equal(t, 1, acc, "job stop after the first run because it returns an error")
 }