Add few default layout settings to user preferences
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### Proposal
I would like to request an extension of the user preferences. I'm missing some "default layout" settings.
- Left sidebar collapsed: Yes/No
- Right sidebar collapsed: Yes/No
- Default compare changes: Inline/Side-by-side

#### Problem
Every time I have to log in to GitLab, the pages are displayed in the default layout and I have to reset everything to achieve my comfort.
#### Goal
- Increase user comfort.
- Speed up work after login.
issue