Remove array api namespace

[mtar]

Due Diligence

• General:
  • title of the PR is suitable to appear in the Release Notes
• Implementation:
  • unit tests: all split configurations tested
  • unit tests: multiple dtypes tested
  • NEW unit tests: MPS tested (1 MPI process, 1 GPU)
  • benchmarks: created for new functionality
  • benchmarks: performance improved or maintained
  • documentation updated where needed

Description

This PR removes the Array API Namespace and moves the skips.txt and xfails.txt files for testing.

Issue/s resolved: #2420

Changes proposed:

• Delete array_api
• move skips.txt and xfails.txt to .github
• update namespace in test

Type of change

Breaking Change

Memory requirements

Performance

Does this change modify the behaviour of other functions? If so, which?

yes / no

[brownbaerchen]

Great, thanks! What's the merge process for this? Can you trigger the array API tests on this branch and post the result?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.50%. Comparing base (5eaa75a) to head (e8648c4).
⚠️ Report is 4 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2513      +/-   ##
==========================================
+ Coverage   83.76%   90.50%   +6.74%     
==========================================
  Files         105       90      -15     
  Lines       15739    14566    -1173     
==========================================
  Hits        13183    13183              
+ Misses       2556     1383    -1173     

Flag	Coverage Δ
unit	90.50% <ø> (+6.74%)	⬆️

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