Improve how the validation errors are communicated

[yeikel]

Issue submitter TODO list

• [X] I've searched for an already existing issues here
• [X] I'm running a supported version of the application which is listed here and the feature is not present there

Is your proposal related to a problem?

No response

Describe the feature you're interested in

When there are JSON validation errors for Kafka connect configurations, there is only a tiny error message that it is very hard to miss

This error is very problematic for the dark theme as it is very hard to read

Perhaps an easy win could be to change the color of the text to red and make it visible across all themes, or maybe we should change how this looks.

Describe alternatives you've considered

No response

Version you're running

53a6553765a806eda9905c43bfcfe09da6812035

Additional context

No response