feat: check CI failures before land

[codebytere]

Closes #377.

We were previously checking for actual CI results in GitHub Actions-based CI, but not for Jenkins - this adds in and updates logic to aggregate Jenkins results into landing preparation.

Using nodejs/node#33498 as a test case:

Before:

After:

cc @sam-github @joyeecheung @targos

[codecov]

Codecov Report

Merging #422 into master will increase coverage by 0.79%.
The diff coverage is 80.76%.

@@            Coverage Diff             @@
##           master     #422      +/-   ##
==========================================
+ Coverage   76.34%   77.13%   +0.79%     
==========================================
  Files          21       21              
  Lines        1484     1496      +12     
==========================================
+ Hits         1133     1154      +21     
+ Misses        351      342       -9     

Impacted Files	Coverage Δ
lib/pr_checker.js	95.49% <80.00%> (-0.65%)	⬇️
lib/ci/ci_type_parser.js	81.25% <100.00%> (+0.29%)	⬆️
lib/ci/ci_result_parser.js	47.87% <0.00%> (+1.81%)	⬆️
lib/ci/ci_failure_parser.js	80.21% <0.00%> (+2.19%)	⬆️

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