monitor: Cleanup stale history.json files

.gitlab-ci.yml not found in this commit
Status Job ID Name Coverage
  External
running SlapOS.Eggs.UnitTest-luke.Python2

02:50:13

failed SlapOS.Eggs.UnitTest-luke.Python3

18:32

failed SlapOS.Eggs.UnitTest-luke.Python2

13:22

canceled SlapOS.Eggs.UnitTest-luke.Python2

08:03

canceled SlapOS.Eggs.UnitTest-luke.Python3

07:05

 
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