Resolve "Customize branch name when using create branch in an issue"

What does this MR do?

This MR adds an ability to type a custom branch name in the Create merge request dropdown placed in an issue.


  • Add backend specs
  • Add frontend specs

Why was this MR needed?

It improves UX of branch management.

Screenshots (if relevant)

To be added.

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes #21143 (closed)

Edited by Phil Hughes

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