Slowness in FieldRenamesTest

Some methods in FieldRenamesTest assert the absence of records, due to incorrect configuration being given, e.g. shouldNotRenameNestedFieldsToExistingNamesForInsertEvent. They each run about 15 sec, because that's the default timeout for getting records from the test topic, before passing with the assertion on 0 records being available.

That's rather inefficient and we don't really need to assert those non-available records (which cannot be 100% safe anyways). There's already an assertion on the expected error message in the logs, and additionally we should assert that the connector is in FAILED state. The affected tests can be identified by their duration of ~15 sec each.