This commit removes unnecessary clean up code form some unit tests. All database changes done during a test are automatically reverted after the test finishes, so it is not necessary to write code to manually remove them. This change simplifies the test code and make it run a bit faster.
This group is used to identify unit tests that will work only when testing WC core. This is necessary since we are using WC core unit tests to test the custom product tables plugin and some tests should be skipped in this context.