Add a common test label to created resources

[omus]

When the cluster tests encounter failure we avoid deleting the resources which failed in order to facilitate investigations. Unfortunately, cleaning up after failures can be rather tedious so I decided to add this common label to all resources created by these tests to make it easy to delete all created K8s resources via:

kubectl delete pod,job,sa,role,rolebinding -l origin=k8s-cluster-manager-tests

[codecov[bot]]

Codecov Report

Merging #98 (fbf275f) into main (057689a) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #98   +/-   ##
=======================================
  Coverage   66.86%   66.86%           
=======================================
  Files           4        4           
  Lines         172      172           
=======================================
  Hits          115      115           
  Misses         57       57           

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