Remove IronicDefaults since openstack-operator has moved to IronicImages <JIRA: OSPRH-18887>

[mumesan]

Describe your changes

IronicDefaults and setupIronicDefaults are no longer used in openstack-operator and therefore can be removed. No references to them exist anywhere in code.

Jira Ticket Link

Jira: OSPRH-18887

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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