fix: Error handler always prints out the error message when available else the traceback

[AncientPatata]

Motivation

the error_handler captures and obfuscates errors unless --debug is passed.

Description

This PR makes it so it spits out the error message instead of "Internal Error" when said message exists (for gRPC for instance), and in the other case of a generic exception, it always prints the exception with the traceback which might make it easier for the user to understand what went wrong (Basically the behavior of passing in --debug in this case. Click continues to handle its own exceptions.

Testing

Not applicable.

Impact

Not applicable.

Additional Information

Not applicable.

Checklist

• My code adheres to the coding and style guidelines of the project.
• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• I have thoroughly tested my modifications and added tests when necessary.
• Tests pass locally and in the CI.
• I have assessed the performance impact of my modifications.