Rename these tests for clarity
Rename these tests for clarity

All tests were nested under `ReliableRedisDeduplicationTests` although
the last few tests to be added did not deal with deduplication.

This moves the prefixing to the test names and clarify the test case
name. Could also be split into classes but that seems to match what
we've done elsewhere better.

thread/django-lightweight-queue,thread/django-lightweight-queue