Support to create actionset with specific labels using kanctl

[viveksinghggits]

          Also, it would be nice if one could add arbitrary labels. Currently we are creating the actionset the way we want by calling `kanctl` with `--dry-run` and manipulating the yaml with `yq` before applying it with `kubectl`.

Originally posted by @muffl0n in #2285 (comment)

[github-actions]

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