CMP-4436: Add manual rule kubevirt-restrict-exec-access-to-pods (CIS-OCP-Virt 1.11)

[taimurhafeez]

Add a manual rule for CIS OCP-Virt control 1.11 "Restrict exec access to pods". The rule documents the audit procedure (oc adm policy who-can exec pod) 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 on the rule content. Two asks: (1) rebase to drop the duplicated build-script/docs change once #14920 merges; (2) exec is a pod subresource — consider oc adm policy who-can create pods/exec and please verify the current command gives useful output on 4.2x.

[rhmdnd]

Looking good but we'll need to rebase and add something to the description that clearly points users to CustomRules as a way to automate this.

Thanks @taimurhafeez!

[yuumasato]

/ok-to-test

[yuumasato]

/lgtm

Lance's review has been addressed.