Add Labels to jobs created by cleanup pods

[pgvishnuram]

---

Problem:
Currently pods created by cleanup jobs doesn't add labels similar to metadata.labels.
This prevents us to use network policies to block / allow to communication to internal services

How does this PR fix the problem above:

This PR adds ability to utilise existing labels and allow to use new labels from values.yaml

^ Add meaningful description above

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[boring-cyborg]

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[github-actions]

The PR is likely OK to be merged with just subset of tests for default Python and Database versions without running the full matrix of tests, because it does not modify the core of Airflow. If the committers decide that the full tests matrix is needed, they will add the label 'full tests needed'. Then you should rebase to the latest main or amend the last commit of the PR, and push it with --force-with-lease.

[boring-cyborg]

Awesome work, congrats on your first merged pull request!