CMP-4439: Add manual rule kubevirt-restrict-update-access-to-cdi-cr (CIS OCP-Virt 1.14)

[taimurhafeez]

Add a manual rule for CIS OCP-Virt control 1.14 "Restrict update access to the CDI CR". The rule documents the audit procedure (oc adm policy who-can update cdi) 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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