Build: clean up and document integration test convention (#58170)

* clean up and document integration test convention

* clarify integration test conventions

* clean up integration tests that don't follow convention

* mark testIntegration* functions as helpers to avoid confusion

pkg/services/sqlstore/bulk_test.go

@@ -60,7 +60,7 @@ func TestBatching(t *testing.T) {
 	})
 }
 
-func TestBulkOps(t *testing.T) {
+func TestIntegrationBulkOps(t *testing.T) {
 	if testing.Short() {
 		t.Skip("skipping integration test")
 	}