Fixed renaming if the branch names are identical

[CEbbinghaus]

Resolves #1904

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Before the change?

Applying a default branch rule on a repository that already has a default branch with the same name returns a http error 422 causing the tf apply to fail. This is because we call the RenameBranch api trying to rename main to main

After the change?

We validate that the branch being renamed is different from the current default before we try and rename it

Pull request checklist

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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[kfcampbell]

Can you add a test to capture this case, or describe manual testing you've done for this?

[CEbbinghaus]

@kfcampbell Thank you for your feedback, I was looking through the tests and struggled to understand how to integration test with mock calls to the API. I am familiar with Go but haven't yet done any testing with it. Are you able to provide some pointers as to how I could implement the tests?