Error prompting message is not user-friendly

During the editing phase, the error message is not readable by regular users, and can make users panic.


Take this editing for example, users just drag a project operator, but receive an error says "IllegalArgumentException". Although for texera people, we know this error is caused by `Project` operator having no attributes selected by the user yet. But for new users, it is discouraging to see such error without adding anything to the `Project` operator yet.

We should definitely improve this experience.

### Some thoughts

- UI side: add a warning section to the result panel.
- Message side: wrap the error message: `IllegalArgumentException`, with more readable message, e.g. Please select at least 1 attribute to project.