enhance: auto cancel builds pending approval when they become obsolete

[ecrupper]

I am open to making this configurable in the metadata.auto_cancel, but I think presenting the option to approve a build to a repo admin should only involve one build.

This is how Actions does it to some degree. Curious what thoughts are.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (9040349) 62.44% compared to head (061cec5) 62.44%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1066   +/-   ##
=======================================
  Coverage   62.44%   62.44%           
=======================================
  Files         345      345           
  Lines       10251    10254    +3     
=======================================
+ Hits         6401     6403    +2     
- Misses       3376     3377    +1     
  Partials      474      474           

Files	Coverage Δ
database/build/list_pending_running_repo.go	88.23% <100.00%> (ø)
api/build/auto_cancel.go	20.95% <33.33%> (+1.34%)	⬆️

[wass3rw3rk]

i think it makes sense. include "pending approval" builds in the auto-cancel process. 👍🏼