ruff-ecosystem report unsafe fixes

[leandrobbraga]

ruff-ecosystem should report unsafe fixes as well as regular fixes.

A fix was changed from safe to unsafe in a recent PR. ruff-ecosystem reported a reduction of hundreds of fixes across the ecosystem but did not report the corresponding increase in unsafe fixes, which was misleading to me.

ℹ️ ecosystem check detected linter changes. (+0 -0 violations, +0 -858 fixes in 5 projects; 50 projects unchanged)

#22650 (comment)

I believe the report should either be neutral (no change in number of fixes) or explicit (-858 fixes, +858 unsafe-fixes).

[ntBre]

This sounds like a good idea to me! It may help to use the JSON output from Ruff and reconstruct the concise diagnostic only in the output, but that's just an idea.

[leandrobbraga]

If you think this is useful I'm willing to do the work.

[ntBre]

Sure, go for it! What kind of output are you picturing? I think it probably makes sense to preserve the diff and just update the summary line.

It would be kind of nice to do something with the diff lines since the pairs of +/- lines hit the truncation limit twice as fast, but in some cases it's still nice to see which lines were affected.