[service] Add omitempty tag to config fields

[evan-bradley]

Description

Update config structs in the service module to include omitempty tags.

Link to tracking issue

Works toward #12191

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.16%. Comparing base (216046a) to head (a15bd9c).
Report is 19 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12501   +/-   ##
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  Coverage   92.16%   92.16%           
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  Files         465      465           
  Lines       25201    25201           
=======================================
  Hits        23226    23226           
  Misses       1576     1576           
  Partials      399      399           

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[songy23]

Do these need omitempty too?

[evan-bradley]

I probably should have included this in the PR description, my bad. I only added omitempty to fields where the zero value is also the default. Otherwise the zero value won't be emitted during serialization and it would be impossible to generate configs that set the zero value.

For these fields, we have default configurations for both the Logs and Metrics fields, so I didn't add omitempty so they can be unset if need be.