[python] Pass in the full context to open_experiment in pytorch loaders

[ebezzi]

Necessary to train pytorch loaders on a private bucket.

[github-actions]

This PR has not seen any activity in the past 4 weeks; if no one comments or reviews it in the next 3 days, this PR will be closed.

[prathapsridharan]

@ebezzi - Is this still needed?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.12%. Comparing base (39a5d1d) to head (6ec4496).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1108      +/-   ##
==========================================
- Coverage   91.16%   91.12%   -0.05%     
==========================================
  Files          77       77              
  Lines        5896     5891       -5     
==========================================
- Hits         5375     5368       -7     
- Misses        521      523       +2     

Flag	Coverage Δ
unittests	91.12% <100.00%> (-0.05%)	⬇️

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