Ensure transfer work for tables and model tables

[skejserjensen]

The storage engine adds data for both tables and model tables to DataTransfer so the data for both types of table are transferred. However, the tests for DataTransfer currently only uses model table and the use of write_compressed_segments_to_model_table() in transfer_data() implies that it DataTransfer only works for model tables. Thus, the tests should be extended to include tests for tables and any issue they find should be fixed.

[CGodiksen]

The data transfer component has been updated to no longer use write_compressed_segments_to_model_table() exclusively. Testing for both model tables and normal tables is still needed.