Remove job pods when job is done.

[bryanpaget]

Context:

• When the namespace-cleaner is done it leaves its job pod.

Todo:

• Edit the cronjob to delete its working pod when done.

Expected Outcome:

• No leftover pods when the namespace-cleaner is done.

Links

• PR: feat(cronjob): add ttlSecondsAfterFinished to remove pods after completion #37
• JIRA: https://jirab.statcan.ca/browse/BTIS-998

Documentation:

• https://kubernetes.io/docs/concepts/workloads/controllers/job/#clean-up-finished-jobs-automatically