Validate: user adding scans to any branch

What’s this issue all about?

This research issue is a follow up to gitlab#13646 (closed) and #359 (closed). Based on gitlab#34771 (closed) and gitlab#34773 (closed) results, this will be a validation review of the proposed solution.

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Who is the target user of the feature?

What questions are you trying to answer?

Core questions
Additional questions

What hypotheses and/or assumptions do you have?

What decisions will you make based on the research findings?

What's the latest milestone that the research will still be useful to you?