Use cargo-nextest 🚀

[jmackie]

https://nexte.st/

Partly because it's faster (locally, at least) and partly because I want to use datatest-stable.

[codecov]

Codecov Report

Merging #93 (2009ed0) into main (74d872f) will increase coverage by 7.34%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #93      +/-   ##
==========================================
+ Coverage   74.03%   81.37%   +7.34%     
==========================================
  Files         111       82      -29     
  Lines        8406    14595    +6189     
==========================================
+ Hits         6223    11877    +5654     
- Misses       2183     2718     +535     

Impacted Files	Coverage Δ
crates/ditto-cst/src/lexer.rs	63.37% <0.00%> (-30.63%)	⬇️
crates/ditto-cst/src/module.rs	89.36% <0.00%> (-10.64%)	⬇️
crates/ditto-fmt/src/helpers.rs	73.33% <0.00%> (-7.92%)	⬇️
crates/ditto-cst/src/parser/mod.rs	82.60% <0.00%> (-6.29%)	⬇️
crates/ditto-make/src/utils.rs	96.77% <0.00%> (-3.23%)	⬇️
crates/ditto-codegen-js/src/convert.rs	93.26% <0.00%> (-2.07%)	⬇️
crates/ditto-make/src/build_ninja.rs	92.54% <0.00%> (-1.68%)	⬇️
crates/ditto-checker/src/result/warnings.rs	98.41% <0.00%> (-1.59%)	⬇️
crates/ditto-fmt/src/has_comments.rs	43.88% <0.00%> (-0.86%)	⬇️
crates/ditto-checker/src/kindchecker/mod.rs	80.47% <0.00%> (-0.28%)	⬇️
... and 106 more

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