Add test for when lorentzfactor and multiple particles are provided to gyroradius

[namurphy]

This PR fixes a bug where a ValueError is raised when providing the Lorentz factor to gyroradius, along with more than one particle.

This PR adds a test for a bugfix, which was actually done in #2542. I changed the changelog entry to #2542 accordingly.

This bug probably remained hidden because we haven't added enough tests of formulary functions with ParticleList objects after decorating them with @particle_input. It probably arose in part because gyroradius has significantly higher cognitive complexity than I'd like (see also #2371).

Closes #2536. Many thanks to @jwreep for finding and reporting this bug!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.34%. Comparing base (20e60aa) to head (5fb10bf).
Report is 44 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2539      +/-   ##
==========================================
+ Coverage   96.93%   97.34%   +0.41%     
==========================================
  Files         104      104              
  Lines        9163     9347     +184     
==========================================
+ Hits         8882     9099     +217     
+ Misses        281      248      -33     

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[jwreep]

Could I ask what the following means?
# noqa: C901, PLR0915

[namurphy]

Could I ask what the following means? # noqa: C901, PLR0915

Absolutely, that is a great question! The noqa is short for "no quality assurance". The strings on the right are telling the ruff linter to ignore error codes C901 and PLR0915. The comment is essentially saying that we know that gyroradius is too long and complex, but that we should ignore those problems (at least for now).

[namurphy]

This PR might be partially superseded by #2542, but we'll probably still want to add the test case to make sure.