Add sidebar to "Create merge request" page

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Issue

Now that work items have a sidebar on the Create screen, we should do the same with merge requests.

Proof of concept MR --> Draft: Move create merge request metadata to si... (!197830 - closed)

Create work item Create merge request
Screenshot_2025-08-06_at_11.44.47_AM Screenshot_2025-08-06_at_11.45.42_AM
Edited by 🤖 GitLab Bot 🤖