test(spanner): add logs to debug the configName used for TestIntegrat…

…ion_StartBackupOperation test (#5158)

* test(spanner): add logs to debug the configName used for TestIntegration_StartBackupOperation test

Co-authored-by: Rahul Yadav <irahul@google.com>
Co-authored-by: Hengfeng Li <hengfeng@google.com>

spanner/integration_test.go

@@ -282,6 +282,7 @@ func initIntegrationTests() (cleanup func()) {
 		}
 		configName = config.Name
 	}
+	log.Printf("Running test by using the instance config: %s\n", configName)
 
 	// First clean up any old test instances before we start the actual testing
 	// as these might cause this test run to fail.