Add status checks property to conclude unstable builds as neutral ones

[XiongKezhi]

context: #46

[codecov]

Codecov Report

Merging #78 (88e8b75) into master (64dc0a6) will decrease coverage by 0.39%.
The diff coverage is 20.00%.

@@             Coverage Diff              @@
##             master      #78      +/-   ##
============================================
- Coverage     87.31%   86.92%   -0.40%     
  Complexity      139      139              
============================================
  Files            16       16              
  Lines           623      627       +4     
  Branches         47       48       +1     
============================================
+ Hits            544      545       +1     
- Misses           63       65       +2     
- Partials         16       17       +1     

Impacted Files	Coverage Δ	Complexity Δ
.../checks/status/AbstractStatusChecksProperties.java	50.00% <0.00%> (-10.00%)	1.00 <0.00> (ø)
...gins/checks/status/BuildStatusChecksPublisher.java	80.26% <25.00%> (-1.93%)	14.00 <0.00> (ø)

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