chore(ci): use cargo-nextest for running tests

[orhun]

Switch to nextest for running tests.

Motivation:

• cargo test: 19.332s
• cargo nextest run: 0.981s

Please note:

• cargo-nextest does not support running doctests yet: Add support for doctests nextest-rs/nextest#16
• The cargo-nextest binary is installed automatically via cargo-make, see https://github.com/sagiegurari/cargo-make#crates

[joshka]

It would be good to be have the fast unit tests run before the slow doc tests.

[orhun]

Good idea, done in 39e5d45

What we can also do is running them in parallel, but then we get a bunch of "Blocking waiting for file lock on package cache" and the speedup is not significant.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ee54493) 91.9% compared to head (39e5d45) 91.9%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #717   +/-   ##
=====================================
  Coverage   91.9%   91.9%           
=====================================
  Files         42      42           
  Lines      14042   14042           
=====================================
  Hits       12915   12915           
  Misses      1127    1127           

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[joshka]

What we can also do is running them in parallel, but then we get a bunch of "Blocking waiting for file lock on package cache" and the speedup is not significant.

Probably best to avoid that.