TST: Add Tests for insert and delete

Integration tests for https://gitlab.indiscale.com/caosdb/customers/lfpb/management/-/issues/394 and caosdb-cpplib!4 (merged).

test/test_transaction.cpp

@@ -323,6 +323,7 @@ TEST(test_transaction, insert_delete_with_property) {
   rec.SetRole("Record");
   rec.AppendParent(parent);
   rec.AppendProperty(prop_rec);
+  std::cout << rec.ToString() << std::endl;
 
   auto rec_insertion(connection->CreateTransaction());
   rec_insertion->InsertEntity(&rec);
@@ -330,6 +331,7 @@ TEST(test_transaction, insert_delete_with_property) {
 
   auto rec_insert_status = rec_insertion->WaitForIt();
 
+  std::cout << rec_insert_status.GetCode() << std::endl;
   ASSERT_TRUE(rec_insert_status.IsTerminated());
   ASSERT_FALSE(rec_insert_status.IsError());