[explore] improve database error handling

[mistercrunch]

Screenshot

Description

This kind of error (DatabaseError) should be expected and handled well. It should really say something like BigQuery error and offer the right detail as well as monospace-formatted details.

Somehow SQL Lab does a better job at surfacing the error message from the database:

We may need database-specific handling of error message strings, so that we can decompose a title, subtitle (one line message) and a longer description. For BigQuery for example, it'd be nice to show only that first string and allow to expand the longer multi-line blob.

[nytai]

This should be fixed by #14040. If I'm incorrect, please reopen