uv

5773b12f - Isolating test from accessing global git credential helper config (#16895)

Isolating test from accessing global git credential helper config (#16895) ## Summary Resolves: https://github.com/astral-sh/uv/issues/1980 Added a utility function to TestContext called **with_git_credential_helper_blocked** that isolates the test from accessing the credential helper value defined in global/system git config. It does so, by writing to a file .gitconfig in the temporary home_dir that is created as part of the TestContext. ## Test Plan Tested it by running the test pip_install::install_git_private_https_pat_and_username, and making sure it doesn't affect the keyring. ## Note: The commit hash for the uv-private-package seems to have changed. Kindly, ensure that the modification related to that is correct.