1. The :test adapter wasn't going through a full cycle of
serialize/deserialize when performing jobs. Now it does
2. Regular AJ tests were not run for the :test adapter. Now they are
3. ActiveJob::TestHelper uses assert_valid_keys but doesn’t requires
the file that implements that method. Now it does
It will set proper queue_adapter state required by assert_performed_jobs assertions.
Also the block version of assert_performed_jobs will make sure this
state is respected.
Fixes#17684