Show distinct error message when knative domain update fails

Problem to solve

Currently, we're re-using the "upgrade failed" error message when updating the Knative domain. This is confusing.

image

Further details

Proposal

Provide a dedicated error message for the scenario.

Something went wrong while updating the Knative domain. Please check the logs and try again.

The button label should simply read Retry.

Documentation

What does success look like, and how can we measure that?

Links / references