Improve exception stack printing #36606
Merged
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The expanded stacktrace printing introduced in #36134 and the fact that
we no longer print errors in red (#36015) makes it harder to distinguish
distinct exceptions in the stack.
Add a newline for this, and print the "caused by" in dark red. Also remove
exception numbering, which was arguably not very helpful.
Arguably this (along with previous changes over time) fixes #31257.
Before:
After: