fix(github): Resolve branch name issue for protected branches

[eratio08]

Summary:

Resolves #1417

Currently it's not possible to perform any api action on protected branches using the Github integration. The branch name is not determined correctly as the logic assumes the branch to be a simple string when it's actually an object.

Description for the changelog:

Check if the branch parameter is an object to access the value field for the branch name, otherwise use the parameter as the branch name.

Declaration:

• appropriate unit tests have been created / modified
• functional tests created / modified for changes in functionality (Not sure if this applies, due to the github scope)
• any use of AI has been declared in this pull request

Other info:
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[jgadsden]

Hello @eratio08 , could you raise an issue for this please?
(do not worry about the link checker error, that is only transient)

[jgadsden]

thanks for this contribution @eratio08 , and extra kudos for adding unit tests - much appreciated