Switch to using in-mem sequence generator only when explicitly configured in connection string. Move spanner-related functions to pkg/util/spanner. (#103363)

* Switch to using in-mem sequence generator only when explicitly configured in connection string.
Move spanner-related functions to pkg/util/spanner.

pkg/services/sqlstore/migrator/spanner_dialect.go

@@ -17,6 +17,7 @@ import (
 	"google.golang.org/grpc/codes"
 	"xorm.io/core"
 
+	utilspanner "github.com/grafana/grafana/pkg/util/spanner"
 	"xorm.io/xorm"
 
 	_ "embed"
@@ -290,7 +291,7 @@ func (s *SpannerDialect) executeDDLStatements(ctx context.Context, engine *xorm.
 		return err
 	}
 
-	opts := xorm.SpannerConnectorConfigToClientOptions(cfg)
+	opts := utilspanner.ConnectorConfigToClientOptions(cfg)
 
 	databaseAdminClient, err := database.NewDatabaseAdminClient(ctx, opts...)
 	if err != nil {

pkg/services/sqlstore/sqlutil/sqlutil.go

@@ -191,7 +191,7 @@ func spannerTestDB() (*TestDB, error) {
 		//  $ curl "localhost:9020/v1/projects/grafanatest/instances/grafanatest/databases" --data '{"createStatement": "CREATE DATABASE `grafanatest`"}'
 		return &TestDB{
 			DriverName: "spanner",
-			ConnStr:    fmt.Sprintf("%s/projects/grafanatest/instances/grafanatest/databases/grafanatest;usePlainText=true", host),
+			ConnStr:    fmt.Sprintf("%s/projects/grafanatest/instances/grafanatest/databases/grafanatest;usePlainText=true;inMemSequenceGenerator=true", host),
 			Cleanup:    func() {},
 		}, nil
 	}