CMP-4438: Add manual rule kubevirt-restrict-vm-cluster-instance-preference-types (CIS OCP-Virt 1.13)

[taimurhafeez]

Add a manual rule for CIS OCP-Virt control 1.13 "Restrict create/modify Virtual Machine Cluster Instance and Preference Types". The rule documents the audit procedure for checking who can create/update virtualmachineclusterinstancetypes and virtualmachineclusterpreferences, and is added to the cis-vm-extension CEL profile. Also relax build_cel_content.py to warn instead of error when a CEL profile references rules without CEL checks, allowing manual rules in CEL profiles. Update CEL documentation accordingly.

Co-Authored-By: Claude

[openshift-ci]

Hi @taimurhafeez. Thanks for your PR.

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[Vincent056]

LGTM — the four who-can commands match the benchmark. One ask: rebase to drop the duplicated build-script/docs change once #14920 merges.

[rhmdnd]

Overall questions about whether we want to add these manual rules in the first place, or be more intentional about suggesting custom rules instead?

[rhmdnd]

We're on the right track. Just need a rebase and an update to the description that points users to CustomRules as a way to automate this check.

[openshift-ci]

PR needs rebase.

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