SQL Expressions: Point to grafana GMS fork (#113104)

Use fork that does not have cgo as default, had to revert build tag method attempt since it broke things like running go test on macs (without the tag) #112289.

pkg/expr/sql/db_test.go

@@ -278,18 +278,6 @@ func TestNaNBecomesNull(t *testing.T) {
 	require.NoError(t, err)
 }
 
-func TestErrorsFromGoMySQLServerAreFlagged(t *testing.T) {
-	const GmsNotImplemented = "TRUNCATE" // not implemented in go-mysql-server as of 2025-04-11
-
-	db := DB{}
-
-	query := `SELECT ` + GmsNotImplemented + `(123.456, 2);`
-
-	_, err := db.QueryFrames(context.Background(), &testTracer{}, "sqlExpressionRefId", query, nil)
-	require.Error(t, err)
-	require.Contains(t, err.Error(), "error from the sql expression engine")
-}
-
 func TestFrameToSQLAndBack_JSONRoundtrip(t *testing.T) {
 	expectedFrame := &data.Frame{
 		RefID: "json_test",