Converted unit/coords to pytest: Part 2

[ESadek-MO]

Continuation of #6602.

Note: test_CellMeasure and test_CellMethod seem to have been duplicated in this and #6602. Once part 1 is in, I'd suggest updating this branch and checking if there are any merge conflicts.

• init
• test_AuxCoord
• test_DimCoord
• test_Coord
• test_AncillaryVariable
• test_CellMeasure DUPE
• test_CellMethod DUPE

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.33%. Comparing base (3a86a9d) to head (f5ef75d).
⚠️ Report is 86 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6606   +/-   ##
=======================================
  Coverage   90.33%   90.33%           
=======================================
  Files          91       91           
  Lines       24447    24447           
  Branches     4567     4567           
=======================================
  Hits        22085    22085           
  Misses       1591     1591           
  Partials      771      771           

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[trexfeathers]

You trooper @ESadek-MO