Remove tests that break with NumPy 2.4 ArrayLike changes

[mdekstrand]

Since NumPy 2.4, our type-checking logic for ArrayLike broke, so this removes the tests for it. It wasn't used anywhere.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.05%. Comparing base (286d8c1) to head (94a2946).
⚠️ Report is 4 commits behind head on series/2025.

Additional details and impacted files

@@               Coverage Diff               @@
##           series/2025     #977      +/-   ##
===============================================
+ Coverage        88.95%   89.05%   +0.10%     
===============================================
  Files              215      215              
  Lines            14961    14961              
===============================================
+ Hits             13308    13323      +15     
+ Misses            1653     1638      -15     

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