ci: add update-ui-tests nox session

[davidhewitt]

A new nox session to update UI tests for all relevant feature combinations. I built this while working on #3978 after I made the mistake of not updating them all several times.

At the same time, I tweaked the nox output on GitHub Actions to hopefully make it slightly easier to spot where errors occur in things like the clippy jobs.

[codspeed-hq]

CodSpeed Performance Report

Merging #3979 will not alter performance

_{Comparing davidhewitt:nox-update-ui-tests (9b5dc21) with main (d0f5b6a)}

🎉 Hooray! codspeed-rust just leveled up to 2.4.0!

A heads-up, this is a breaking change and it might affect your current performance baseline a bit. But here's the exciting part - it's packed with new, cool features and promises improved result stability 🥳!
Curious about what's new? Visit our releases page to delve into all the awesome details about this new version.

Summary

✅ 67 untouched benchmarks

[davidhewitt]

The tweak makes it easier to see what's failed, so that the collapsed group can then be expanded! 🚀