Migrate to xunit v3

[martincostello]

Migrate tests to xunit v3.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.17%. Comparing base (a41def2) to head (a06b924).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1282   +/-   ##
=======================================
  Coverage   90.17%   90.17%           
=======================================
  Files          18       18           
  Lines         285      285           
  Branches       22       22           
=======================================
  Hits          257      257           
  Misses         20       20           
  Partials        8        8           

Flag	Coverage Δ
linux	90.17% <ø> (ø)
macos	90.17% <ø> (ø)
windows	90.17% <ø> (ø)

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