sql: refactor code, eliminate from-core-grafana import (#77810)

pkg/tsdb/sqleng/resample_test.go

@@ -7,7 +7,7 @@ import (
 	"github.com/google/go-cmp/cmp"
 	"github.com/grafana/grafana-plugin-sdk-go/backend"
 	"github.com/grafana/grafana-plugin-sdk-go/data"
-	"github.com/grafana/grafana/pkg/util"
+	"github.com/grafana/grafana/pkg/tsdb/sqleng/util"
 	"github.com/stretchr/testify/require"
 )
 

pkg/tsdb/sqleng/sql_engine_test.go

@@ -13,7 +13,7 @@ import (
 	"github.com/stretchr/testify/require"
 
 	"github.com/grafana/grafana/pkg/infra/log"
-	"github.com/grafana/grafana/pkg/util"
+	"github.com/grafana/grafana/pkg/tsdb/sqleng/util"
 )
 
 func TestSQLEngine(t *testing.T) {

pkg/tsdb/sqleng/util/util.go

@@ -0,0 +1,3 @@
+package util
+
+func Pointer[T any](v T) *T { return &v }