Clean up temporary clone paths by default

[zackproser]

Description

Fixes #98 .

These changes allow git-xargs to clean up the temporary file paths where it clones repositories. By default, git-xargs will now delete the paths after processing the repo. If you wish to preserve your local clones, pass the new --keep-cloned-repositories flag.

TODOs

Read the Gruntwork contribution guidelines.

• [x] Update the docs.
• [x] Run the relevant tests successfully, including pre-commit checks.
• [x] Ensure any 3rd party code adheres with our license policy or delete this line if its not applicable.
• [x] Include release notes. If this PR is backward incompatible, include a migration guide.

Release Notes (draft)

By default, git-xargs will now delete the temporary file paths where it clones your repositories in order to run commands on them. This should help prevent git-xargs from taking up too much space. If you wish to preserve local clone paths going forward, pass the new --keep-cloned-repositories flag.

Migration Guide

[zackproser]

LGTM! (but not sure if my approval will count) edit: it did not

Thank you @Etiene! :raised_hands:

[pliniodng]

Hey @zackproser, thanks for taking the time and writing the PR. Looks good, thanks!

[zackproser]

Thanks for reviews! Going to merge this in now.