[ansible] Add option to set service CLI args

[pjanotti]

Adds a specific option to set the command-line arguments used to launch the collector service on Linux - Windows implementation is coming after #6268 is released.

The test for this new config setting is piggy-backing on the test for custom environment variables due to the similarities and to avoid yet another test for some CI that is already relatively long to run.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.90%. Comparing base (44069e4) to head (856c77c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6270      +/-   ##
==========================================
+ Coverage   44.88%   44.90%   +0.02%     
==========================================
  Files         390      390              
  Lines       26994    26994              
==========================================
+ Hits        12115    12122       +7     
+ Misses      14012    14006       -6     
+ Partials      867      866       -1     

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