Include NUnit parser from coverage-model

[jonesbusy]

Include NUnit parser from coverage-model from jenkinsci/coverage-model#69

Testing done

Automated tests and create one integration test

Submitter checklist

Beta Give feedback

1. Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
2. Ensure that the pull request title represents the desired changelog entry
3. Please describe what you did
4. Link to relevant issues in GitHub or Jira
5. Link to relevant pull requests, esp. upstream and downstream changes
6. Ensure you have provided tests - that demonstrates feature works or fixes the issue

[github-actions]

• Surviving mutants in this change: 1
• Killed mutants in this change: 0

class	surviving	killed
io.jenkins.plugins.coverage.metrics.steps.CoverageTool$CoverageToolDescriptor	1	0

See https://pitest.org/

[uhafner]

See: https://github.com/jenkinsci/coverage-model/releases/tag/v0.39.0

[github-actions]

• Surviving mutants in this change: 1
• Killed mutants in this change: 0

class	surviving	killed
io.jenkins.plugins.coverage.metrics.steps.CoverageTool$CoverageToolDescriptor	1	0

See https://pitest.org/

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (a8fafb0) 81.77% compared to head (306aecd) 81.89%.

Files	Patch %	Lines
...s/plugins/coverage/metrics/steps/CoverageTool.java	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #66      +/-   ##
============================================
+ Coverage     81.77%   81.89%   +0.12%     
  Complexity      760      760              
============================================
  Files            47       47              
  Lines          2655     2657       +2     
  Branches        253      253              
============================================
+ Hits           2171     2176       +5     
+ Misses          401      400       -1     
+ Partials         83       81       -2     

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