[chore] Reduce port contention in service tests

[evan-bradley]

Description

I noticed the service tests were a little flaky due to using the default Prometheus port. This should at least reduce the frequency where this happens if not eliminate it.

I did two things to help elimination contention for the port:

1. Disable the Prometheus server in tests where it isn't needed.
2. Ensure the port is randomized in tests where it is needed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.19%. Comparing base (d3c5895) to head (b455129).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12616      +/-   ##
==========================================
+ Coverage   92.16%   92.19%   +0.02%     
==========================================
  Files         471      471              
  Lines       25561    25561              
==========================================
+ Hits        23558    23565       +7     
+ Misses       1591     1586       -5     
+ Partials      412      410       -2     

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[codeboten]

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