testing: (wgpu interpreter) remove wgpy pytest

[superlopuh]

We have an xdsl-run based lit test for the same input, I don't see why we want both.

https://github.com/xdslproject/xdsl/blob/fcc7520f31a61175b1f3b8eabe33bf3ce29319e4/tests/filecheck/runner/with-wgpu/global_id_inc.mlir

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.27%. Comparing base (fcc7520) to head (ae4d298).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3729      +/-   ##
==========================================
- Coverage   91.28%   91.27%   -0.01%     
==========================================
  Files         468      467       -1     
  Lines       58611    58579      -32     
  Branches     5656     5656              
==========================================
- Hits        53502    53470      -32     
  Misses       3659     3659              
  Partials     1450     1450              

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