Description of problem:

Auto prune is allowing to configure both keep and keep-since

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

Test case

Actual results:

Able to configure bore keep and keep-since

Expected results:

Below error should be shown when user tries to update both keep and keep-since

validation failed: expected exactly one, got both: spec.pruner.keep, spec.pruner.keep-since

Reproducibility (Always/Intermittent/Only Once):

Always