coral: Topic request validation does not take invalid advanced config into account

# What happened?

While we track of the advanced topic config is valid (in `onValidate` in `AdvancedConfiguration`) we don't take that into account for form validation. User can create a request with an invalid config and won't get an error.

This topic then can not be approved, but the error is very vague ("Unable to process the request. Please contact our Administrator !!")

This can be improved by taking the editor validation into account.