monitor: Cleanup stale history.json files

5 jobs for <span class="ref-name">feature/promise-cleanup</span> in 0 seconds
Status Job ID Name Coverage
  External
running SlapOS.Eggs.UnitTest-luke.Python2

9009:40:25

failed SlapOS.Eggs.UnitTest-luke.Python3

00:18:32

failed SlapOS.Eggs.UnitTest-luke.Python2

00:13:22

canceled SlapOS.Eggs.UnitTest-luke.Python2

00:08:03

canceled SlapOS.Eggs.UnitTest-luke.Python3

00:07:05