✨ Skip reconciliation if deleting cluster

[kahirokunn]

What this PR does / why we need it:
This PR introduces a feature to skip reconciliation when a cluster is in the process of being deleted. By checking the DeletionTimestamp of the cluster, the controller avoids creating or updating HelmReleaseProxy resources, ensuring a clean and efficient cluster teardown without unnecessary operations or potential errors.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #319 (comment)

[k8s-ci-robot]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: kahirokunn
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[k8s-ci-robot]

Hi @kahirokunn. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[Jont828]

/ok-to-test

[Jont828]

Will approve once tests pass

[kahirokunn]

@Jont828 Thank you for letting me know! The tests have passed successfully, so I believe this is ready for your final approval. Please let me know if there's anything else you'd like me to address. 😊

[mboersma]

/lgtm
/assign @Jont828