remove missing image and fix failing tests

[JimBugwadia]

Related Issue(s)

n/a

Description

Fix tests:

1. Remove image ghcr.io/samj1912/myapp that was causing test failures:

failed to load data error="failed to fetch image descriptor: ghcr.io/samj1912/myapp:latest, error: failed to fetch image descriptor: ghcr.io/samj1912/myapp:latest, error: failed to fetch image reference: ghcr.io/samj1912/myapp:latest, error: GET https://ghcr.io/token?scope=repository%3Asamj1912%2Fmyapp%3Apull&service=ghcr.io: DENIED: requested access to the resource is denied" logger=DefaultContextLoaderFactory name=imageData

2. Fix tests in pod-security-cel/restricted/disallow-privilege-escalation.

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.