fix: don't start zmq when fast_queue=false

[aniketmaurya]

What does this PR do?

Broker doesn't need to be running when user sets fast_queue=False which means we won't use zmq as queue.

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• Did you write any new necessary tests?

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89%. Comparing base (515f28b) to head (457dedb).
Report is 2 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #417   +/-   ##
===================================
  Coverage    89%    89%           
===================================
  Files        31     31           
  Lines      2020   2021    +1     
===================================
+ Hits       1807   1808    +1     
  Misses      213    213