Refactor KafkaConnectBuildTest to unify it with other tests

[scholzj]

Type of change

• Refactoring

Description

This PR refactors thre KafkaConnectBuildTest to make it more in-sync with other Connect and MM2 unit tests. It uses static variables to configure things in a single place, makes sure the Connect resources used in the tests are valid Connect resources, and merges some tests together where it made sense.

Checklist

• Make sure all tests pass

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.79%. Comparing base (fcc675d) to head (8946da6).

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #12219      +/-   ##
============================================
+ Coverage     74.77%   74.79%   +0.01%     
- Complexity     6625     6630       +5     
============================================
  Files           377      377              
  Lines         25360    25360              
  Branches       3402     3402              
============================================
+ Hits          18963    18967       +4     
+ Misses         5008     5007       -1     
+ Partials       1389     1386       -3     

see 2 files with indirect coverage changes

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