Surface reasons why Comet is disabled to Spark UI

### What is the problem the feature request solves?

It will be very useful to surface the reason(s) why Comet is disabled and have to fallback to Spark. For instance, which expressions, data types, operators, etc, are not supported. Ideally we can expand the Spark UI page (the same page which shows the Spark plan diagram) by adding a separate section for the reasons. This is better than having the users to dig out the reason from logs.

### Describe the potential solution

_No response_

### Additional context

_No response_