Branch picker when creating an MR

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Proposal

When creating a merge request from an issue, via the 'Create Merge Request' button, the following dialog is displayed: image If we are creating a branch from anything other than main it means going to another tab to find the list of branches, then copying that in.

Suggestion - add a picker with a list of branches in this dialog.

Edited by 🤖 GitLab Bot 🤖