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

@@ -119,7 +119,8 @@ TEST(test_transaction, insert_delete) {
   // Should have a warning since it has no properties
   EXPECT_TRUE(new_entity.HasWarnings());
   EXPECT_EQ(new_entity.GetWarnings().Size(), 1);
-  EXPECT_EQ(new_entity.GetWarnings().At(0).GetCode(), MessageCode::ENTITY_HAS_NO_PROPERTIES);
+  EXPECT_EQ(new_entity.GetWarnings().At(0).GetCode(),
+            MessageCode::ENTITY_HAS_NO_PROPERTIES);
 
   auto delete_transaction(connection->CreateTransaction());