Chore: Make Cfg field private in SQLStore (#85593)

* make cfg private in sqlstore

* fix db init in tests

* fix case

* fix folder test init

* fix imports

* make another Cfg private

* remove another Cfg

* remove unused variable

* use store cfg, it has side-effects

* fix mutated cfg in tests

pkg/services/sqlstore/bulk_test.go

@@ -64,7 +64,7 @@ func TestIntegrationBulkOps(t *testing.T) {
 	if testing.Short() {
 		t.Skip("skipping integration test")
 	}
-	db := InitTestDB(t)
+	db, _ := InitTestDB(t)
 	err := db.engine.Sync(new(bulkTestItem))
 	require.NoError(t, err)