Support cloning private repositories

[jerbly]

Fix: Use default git open options instead of isolated mode when cloning repositories, enabling system credential helpers (e.g. osxkeychain, manager, libsecret) for private repository access.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.2%. Comparing base (bd15e50) to head (b2e0560).

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1306   +/-   ##
=====================================
  Coverage   81.2%   81.2%           
=====================================
  Files        111     111           
  Lines       9371    9371           
=====================================
+ Hits        7615    7616    +1     
+ Misses      1756    1755    -1     

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