test: add simple compatibility test for new errors.Join

[tdakkota]

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (ff8939f) 86.01% compared to head (493a352) 86.01%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #24   +/-   ##
=======================================
  Coverage   86.01%   86.01%           
=======================================
  Files           8        8           
  Lines         236      236           
=======================================
  Hits          203      203           
  Misses         29       29           
  Partials        4        4           

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