[BUG] Owner rules require a mixture of annotation/label

[AndiDog]

Describe the bug

required-annotation-email needs an annotation, required-label-owner needs a label. Also, both names are non-standardized. I suggest to make this consistent and probably use the ideas from Annotating Kubernetes Services for Humans to create a de-facto standard.

[janisz]

I love this idea. But first we need to research what are currently used labels