Feature #875: Delete referring branches

[alessandroasm]

This Pull Request fixes/closes #875.

It changes the following:

• After deleting a branch, check if there are any upstream / tracking branches and ask if user wants to delete them as well.

I followed the checklist:

• [x] I added unittests
• [x] I ran make check without errors
• [x] I tested the overall application
• [x] I added an appropriate item to the changelog

[alessandroasm]

Hello @extrawurst, thanks for the quick review and suggestions. I've just updated the PR with the following:

• Reverted the refactoring and added the annotation to disable clippy::too_many_lines error
• Added some assertions for get_branch_trackers in the existing unittests
• Fixed the string passed to Action::DeleteBranch. I was passing the branch name instead of a full ref 🤦‍♂️

[alessandroasm]

I've made the changes requested. Please have a look at my reply about Action::DeleteRemoteBranch.

[extrawurst]

marking as Draft until the remaining comments are addressed

[extrawurst]

@alessandroasm are you still planning to move this forward?

[stale[bot]]

This issue has been automatically marked as stale because it has not had any activity half a year. It will be closed in 14 days if no further activity occurs. Thank you for your contributions.