azcore fix: initialize request pipeline with configured cloud

[thomas11]

Fixes #3795, hopefully.

The way Azure's azcore and azidentity SDKs are designed makes it hard to test this, but reading the source here it looks like this change should fix the issue.

[github-actions]

Does the PR have any schema changes?

Looking good! No breaking changes found.
No new resources/functions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.01%. Comparing base (c57661c) to head (89e784c).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3802      +/-   ##
==========================================
+ Coverage   57.00%   57.01%   +0.01%     
==========================================
  Files          78       78              
  Lines       12035    12041       +6     
==========================================
+ Hits         6860     6865       +5     
- Misses       4675     4676       +1     
  Partials      500      500              

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[mjeffryes]

Approving b/c I don't want to block you on timezone delta and it makes sense that this could fix the issue, but would be nice to capture this requirement in some sort of test or at least a comment.

[pulumi-bot]

This PR has been shipped in release v2.79.0.