Add cleanups for lingering k8s resources

[ponyisi]

New cronjob to delete transformer deployments, configmaps, and autoscalers older than a configurable age. Will shut down lingering transformer pods as a consequence.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.03%. Comparing base (d6ace18) to head (2b53663).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1283      +/-   ##
===========================================
+ Coverage    86.50%   87.03%   +0.53%     
===========================================
  Files           95       96       +1     
  Lines         3304     3379      +75     
  Branches       381      396      +15     
===========================================
+ Hits          2858     2941      +83     
+ Misses         375      367       -8     
  Partials        71       71              

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