jenkins: show number of running jobs in "wait until jenkins is idle" command

[brainexe]

No description provided.

[codecov-commenter]

Codecov Report

Merging #296 (3847c17) into master (f055a63) will increase coverage by 0.01%.
The diff coverage is 84.61%.

@@            Coverage Diff             @@
##           master     #296      +/-   ##
==========================================
+ Coverage   85.04%   85.05%   +0.01%     
==========================================
  Files         113      113              
  Lines        4788     4792       +4     
==========================================
+ Hits         4072     4076       +4     
  Misses        629      629              
  Partials       87       87              

Impacted Files	Coverage Δ
command/jenkins/inform_idle.go	92.30% <84.61%> (+0.35%)	⬆️

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