[Chainsaw Tests] Add Chainsaw Test for Pod Security Disallow ProcMount Cluster Policy

[mohamedawnallah]

Related Issue(s)

Partial Fix for Issue #950

Description

Chainsaw test the disallow-proc-mount.yaml Cluster Policy with valid and invalid containers & init containers as test manifests.

Additional Context

Kubernetes Pod Security Standards Docs:
https://kubernetes.io/docs/concepts/security/pod-security-standards/

Checklist

• I have read the policy contribution guidelines.
• I have added test manifests and resources covering both positive and negative tests that prove this policy works as intended.
• I have added the artifacthub-pkg.yml file and have verified it is complete and correct.

[chipzoller]

As mentioned in the annotation for this policy, it cannot be tested without modifications to the API server which we aren't doing at this time.