Add cleanup option to remove local data and delete forks

[jonesbusy]

Add 2 options for local data and forks cleanup. Use with caution, but we will only delete forks if no open PR are open from them.

I think we should optimize to only fork when there is actual changes to be pushed.

Probably we should only change the order

• Clone/fetch always from upstream
• Create local branch
• If there is any commit fork and change the origin
• Push the branch and create PR

This PR also add some automated tests for the Plugin class

Submitter checklist

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• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue