Update kyverno policies to work with version 1.8.0

[glrf]

Kyverno v1.8.0 https://github.com/projectsyn/component-kyverno/pull/61 introduces multiple breaking changes. Most importantly missing fields now evaluate to null instead of "", and exclude now needs to use the any keyword to be able to match a clusterrole or a subject (and not both)

Checklist

• [x] PR contains a single logical change (to build a better changelog).
• [x] Update the documentation.
• [x] Categorize the PR by setting a good title and adding one of the labels: bug, enhancement, documentation, change, breaking, dependency as they show up in the changelog.
• [x] Link this PR to related issues or PRs.

[glrf]

I manually tested the policies for both 1.7 and 1.8. I'm fairly sure they now work as expected of both versions