[ISV-5276] Create helper functions for GitHub branches for copy and delete operations.

[haripate]

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[mporrato]

Have you tried to copy a branch between two different repos with different histories (as opposed to making a duplicate of an existing branch on a specific repo)? Does it work?

[harita96]

Have you tried to copy a branch between two different repos with different histories (as opposed to making a duplicate of an existing branch on a specific repo)? Does it work?

@mporrato I updated the PR with new changes where the copy operation between two repo with different history is possible. I tested it in my local system and it is working.