Converted unit/coords to pytest: Part 1

[ESadek-MO]

🚀 Pull Request

Description

Note, this is split into multiple pull requests to make it easier to review. See #6606

• test_CellMethod
• test_CellMeasure
• test__DimensionalMetadata
• test_Cell was converted pre-sprint, in Allow masked data in coords #6468

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.95%. Comparing base (8308d85) to head (0524c88).
⚠️ Report is 126 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6602   +/-   ##
=======================================
  Coverage   89.95%   89.95%           
=======================================
  Files          91       91           
  Lines       24447    24447           
  Branches     4567     4567           
=======================================
  Hits        21992    21992           
  Misses       1686     1686           
  Partials      769      769           

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