FR: Display change id on jj fix errors

[mdrssv]

Is your feature request related to a problem? Please describe.
I've ran jj fix on some commits:

$ jj fix -s tkp::@
lib/..:
error: unexpected closing delimiter: `}`
<snip>


Fixed 0 commits of 33 checked.
Nothing changed.

Describe the solution you'd like
I'd like to know which commit caused the hickup

$ jj fix -s tkp::@
tool rustfmt failed to fix commit: wwwuqmvm cf31a1c8: decode status
lib/..:
error: unexpected closing delimiter: `}`
<snip>

Fixed 0 commits of 33 checked.
Nothing changed.

Describe alternatives you've considered

Could use git bisect to locate the offending commit