fix: Remove failing datetime subclass test

[orlp]

@mcrumiller You can re-introduce these when everything works as expected, right now it's causing spurious CI failures.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.77%. Comparing base (b1b322f) to head (a8a4366).
Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #19068      +/-   ##
==========================================
+ Coverage   79.75%   79.77%   +0.02%     
==========================================
  Files        1531     1531              
  Lines      208547   208547              
  Branches     2913     2913              
==========================================
+ Hits       166319   166378      +59     
+ Misses      41677    41618      -59     
  Partials      551      551              

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[mcrumiller]

Were the date/datetime tests causing issues in addition to the timedelta/time tests?