Add test case to expose issues #227 and #231

[uhafner]

The actual fix is done in the upstream module. This PR just adds a test to expose the issues

• Job URL broken for MultiBranchPipelines #227
• Code Coverage column does not work in Multi-Branch Pipeline #231

See jenkinsci/plugin-util-api-plugin#133

[codecov]

Codecov Report

Merging #243 (5b2bd30) into master (3265db1) will increase coverage by 0.19%.
The diff coverage is 91.66%.

@@             Coverage Diff              @@
##             master     #243      +/-   ##
============================================
+ Coverage     57.98%   58.17%   +0.19%     
- Complexity      480      483       +3     
============================================
  Files            56       56              
  Lines          2304     2305       +1     
  Branches        289      290       +1     
============================================
+ Hits           1336     1341       +5     
+ Misses          863      858       -5     
- Partials        105      106       +1     

Impacted Files	Coverage Δ
...ins/plugins/coverage/model/CoverageTrendChart.java	94.73% <91.66%> (-5.27%)	⬇️
...kins/plugins/coverage/model/CoverageJobAction.java	50.00% <0.00%> (+50.00%)	⬆️

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