[Jenkins 66994] Implemented QualityGate Workflow

[jwalteri]

Implemented QualityGate Workflow with TDD for issue Jenkins 66994.

[codecov[bot]]

Codecov Report

Merging #255 (cced44f) into master (81dc044) will increase coverage by 1.37%. The diff coverage is 90.90%.

@@             Coverage Diff              @@
##             master     #255      +/-   ##
============================================
+ Coverage     57.98%   59.36%   +1.37%     
- Complexity      480      512      +32     
============================================
  Files            56       60       +4     
  Lines          2304     2397      +93     
  Branches        289      292       +3     
============================================
+ Hits           1336     1423      +87     
- Misses          863      865       +2     
- Partials        105      109       +4     

Impacted Files	Coverage Δ
...kins/plugins/coverage/model/QualityGateStatus.java	61.53% <61.53%> (ø)
...io/jenkins/plugins/coverage/model/QualityGate.java	93.75% <93.75%> (ø)
...s/plugins/coverage/model/QualityGateEvaluator.java	95.45% <95.45%> (ø)
...ins/plugins/coverage/model/CoverageStatistics.java	96.87% <96.87%> (ø)
...ins/plugins/coverage/model/CoverageTrendChart.java	94.73% <0.00%> (-5.27%)	:arrow_down:
...ugins/coverage/detector/AntPathReportDetector.java	80.00% <0.00%> (-3.34%)	:arrow_down:
...ins/coverage/source/DefaultSourceFileResolver.java	55.85% <0.00%> (-2.77%)	:arrow_down:
...va/io/jenkins/plugins/coverage/CoverageColumn.java	7.14% <0.00%> (ø)
.../jenkins/plugins/coverage/threshold/Threshold.java	73.33% <0.00%> (ø)
...kins/plugins/coverage/targets/CoverageElement.java	84.61% <0.00%> (ø)
... and 1 more

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[uhafner]

Merged in #512