Craft parts should close stdin when cloning git projects

[mr-cal]

What needs to get done

1. Similar to apt calls (source), craft-parts should close stdin when cloning git repos.
2. If a repo requires credentials, craft-parts should raise a user-friendly error both locally and in CI (snapcraft remote-build is a good test).

Why it needs to get done

If a git repo requires credentials, craft-parts does not prevent block stdin. This produces unhelpful errors.

source: https://chat.canonical.com/canonical/pl/wdbbgdpiupdymyzgfwiuys8cge

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3660.

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