Fix issues in GitHub CI due to 2fa changes on Mila cluster

[lebrice]

• Analyze the comment requesting skipif marks on code_v1 test variants
• Replace xfail with skipif in test_code_v1.py (skips the test entirely in GitHub CI instead of marking as expected failure)
• Add skipif marks to code_v1 parametrized variants in test_code.py's test_code_with_existing_job test

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[lebrice]

@copilot also add a skipif mark to the code_v1 test variants that are causing issues in the CI.

[Copilot]

@copilot also add a skipif mark to the code_v1 test variants that are causing issues in the CI.

Done in 95de615. Changed the xfail in test_code_v1.py to a skipif and added skipif marks to the code_v1 parametrized variant (use_v1=True) in test_code_with_existing_job in test_code.py, both skipping when in_github_CI is true.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.77%. Comparing base (8573991) to head (95de615).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #187      +/-   ##
==========================================
- Coverage   68.97%   68.77%   -0.20%     
==========================================
  Files          17       17              
  Lines        2540     2540              
==========================================
- Hits         1752     1747       -5     
- Misses        788      793       +5     

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