OSPRH-13203: Improve User Input Validation for the Barbican Operator

[mauricioharley]

This PR improves the kubebuilder validators on the several spec items, and implements additional logic for both, ValidateCreate() and ValidateUpdate() functions.

[openshift-ci-robot]

@mauricioharley: This pull request references OSPRH-13203 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "4.19.0" version, but no target version was set.

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In response to this:

This PR improves the kubebuilder validators on the several spec items, and implements additional logic for both, ValidateCreate() and ValidateUpdate() functions.

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mauricioharley

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[openshift-merge-robot]

PR needs rebase.

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