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/transactions_test.go

@@ -13,7 +13,7 @@ func TestIntegrationReuseSessionWithTransaction(t *testing.T) {
 	if testing.Short() {
 		t.Skip("skipping integration test")
 	}
-	ss := InitTestDB(t)
+	ss, _ := InitTestDB(t)
 
 	t.Run("top level transaction", func(t *testing.T) {
 		var outerSession *DBSession
@@ -73,7 +73,7 @@ func TestIntegrationPublishAfterCommitWithNestedTransactions(t *testing.T) {
 		t.Skip("skipping integration test")
 	}
 
-	ss := InitTestDB(t)
+	ss, _ := InitTestDB(t)
 	ctx := context.Background()
 
 	// On X success