Factor out FinishJobParams from the mock services

[MrCreosote]

Can't factor is out of module runner for now since module runner has 0 tests, sigh

[ialarmedalien]

tests are for losers anyway!

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 65.57%. Comparing base (9027203) to head (909950d).
Report is 14 commits behind head on main.

Files with missing lines	Patch %	Lines
src/java/us/kbase/mobu/runner/FinishJobParams.java	0.00%	1 Missing ⚠️
src/java/us/kbase/mobu/runner/JsonRpcError.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #55      +/-   ##
============================================
- Coverage     65.96%   65.57%   -0.40%     
  Complexity     1438     1438              
============================================
  Files            75       77       +2     
  Lines          7020     7062      +42     
  Branches       1318     1318              
============================================
  Hits           4631     4631              
- Misses         1896     1938      +42     
  Partials        493      493              

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