Run tests on nightly with cargo-careful

[robo9k]

This should, in theory, uncover more test problems than regular cargo test.

[robo9k]

Testing this locally, the combination of cargo-llvm-cov and then cargo-careful fails like in GHA. Running only cargo-careful works locally, regardless of the nightly version.

Filed taiki-e/cargo-llvm-cov#318

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (3385e50) 42.27% compared to head (80e0190) 42.27%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #100   +/-   ##
=======================================
  Coverage   42.27%   42.27%           
=======================================
  Files           2        2           
  Lines         511      511           
  Branches      511      511           
=======================================
  Hits          216      216           
  Misses        289      289           
  Partials        6        6           

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[robo9k]

Separate jobs for cargo-llvm-cov and cargo-careful as per linked issue:

Yeah, you have to use two separate CI jobs at this time.