fix(tests): result != expected should fail a test

[bakunowski]

Related Issue(s)

This is required for kyverno/kyverno#12117 to be merged.

Description

This PR fixes two tests that rely on wrong Kyverno behaviour.

In the case of allowed-label-changes:

• test updating a non breakglass label should fail, but it succeeds. Prior to fix(tests): result != expected should fail a test kyverno#12117 this is considered a Pass result.

In the case of prepend-image-registry:

• I'm not entirely sure what the fail case for a mutating policy is, apart from the webhook being unavailable. We could probably fake it with a resource.operation set to something other than CREATE or UPDATE, but I've decided to delete the result: fail tests, and leave the tests checking if mutation happened correctly.

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. (with the caveat of the mutating policy)
• I have added the artifacthub-pkg.yml file and have verified it is complete and correct.

[JimBugwadia]

@bakunowski - can you please help fix the conflict?