[Backport releases/v0.1] feat: cargo nextest support

[fedimint-backports]

Description

Backport of #3156 to releases/v0.1.

[codecov]

Codecov Report

Attention: 35 lines in your changes are missing coverage. Please review.

Comparison is base (f16b910) 59.39% compared to head (5fa070a) 58.91%.

Additional details and impacted files

@@                Coverage Diff                @@
##           releases/v0.1    #3429      +/-   ##
=================================================
- Coverage          59.39%   58.91%   -0.49%     
=================================================
  Files                210      214       +4     
  Lines              45233    45905     +672     
=================================================
+ Hits               26868    27045     +177     
- Misses             18365    18860     +495     

Files	Coverage Δ
fedimint-testing/src/fixtures.rs	82.70% <100.00%> (+0.26%)	⬆️
utils/portalloc/src/data/dto.rs	100.00% <100.00%> (ø)
utils/portalloc/src/util.rs	97.29% <97.29%> (ø)
utils/portalloc/src/lib.rs	69.56% <69.56%> (ø)
utils/portalloc/src/data.rs	41.16% <79.79%> (ø)

... and 14 files with indirect coverage changes

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[dpc]

That backport bot is working overtime.