spanner: Disable running alerting integration tests when using spanner. (#102730)

* Disable running alerting integration tests when using spanner.

* Disable tests for templategroup.

pkg/services/sqlstore/sqlstore.go

@@ -414,6 +414,7 @@ var testSQLStoreSetup = false
 var testSQLStore *SQLStore
 var testSQLStoreMutex sync.Mutex
 var testSQLStoreCleanup []func()
+var testSQLStoreSkipTestsOnBackend string // When not empty and matches DB type, test is skipped.
 
 // InitTestDBOpt contains options for InitTestDB.
 type InitTestDBOpt struct {
@@ -458,6 +459,12 @@ func SetupTestDB() {
 	testSQLStoreSetup = true
 }
 
+func SkipTestsOnSpanner() {
+	testSQLStoreMutex.Lock()
+	defer testSQLStoreMutex.Unlock()
+	testSQLStoreSkipTestsOnBackend = "spanner"
+}
+
 func CleanupTestDB() {
 	testSQLStoreMutex.Lock()
 	defer testSQLStoreMutex.Unlock()
@@ -542,6 +549,10 @@ func TestMain(m *testing.M) {
 	if testSQLStore == nil {
 		dbType := sqlutil.GetTestDBType()
 
+		if testSQLStoreSkipTestsOnBackend != "" && testSQLStoreSkipTestsOnBackend == dbType {
+			t.Skipf("test skipped when using DB type %s", testSQLStoreSkipTestsOnBackend)
+		}
+
 		// set test db config
 		cfg := setting.NewCfg()
 		// nolint:staticcheck