Remove TODO in validateDelete function <JIRA: OSPRH-18888>

[mumesan]

Describe your changes

The validateDelete function will not be implemented and it cannot be removed as a no-op because webhook.Validator has this as an interface. Hence just the TODO comment is removed and replaced with a note.

Jira Ticket Link

Jira: OSPRH-18888

Checklist before requesting a review

• I have performed a self-review of my code and confirmed it passes tests
• Performed pre-commit run --all
• Tested operator image in a test/dev environment. It can be CRC via install_yamls or a hotstack instance (optional)
• Verified that no failures present in logs(optional):
  • ironic-operator-build-deploy-kuttl
  • podified-multinode-ironic-deployment

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hjensas, mumesan

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