[MERGE][PQM] Add TestCaseWithQueue

[Daniel Watkins]

The attached adds a TestCaseWithQueue that all tests that previously
use QueueSetup now use.  It also modifies QueueSetup to be able to
create queues that are empty and/or not processing any further items.
This is to make it easier to test the UI with queues in different
states.

-- 
Daniel Watkins (Odd_Bloke)
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