Project overivew: Add permission check for edit button

What does this MR do and why?

Project overview settings button:

• Add permission check for edit button
• Moved Project information title into the correct location
• Some CSS class fixes

Screenshots or screen recordings

With permissions	Without permissions

How to set up and validate locally

1. Enable FF echo "Feature.enable(:project_overview_reorg)" | rails c
2. Check sidebar with permissions: http://gdk.test:3000/flightjs/Flight
3. Check sidebar without permissions (e.g. logged out): http://gdk.test:3000/flightjs/Flight

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to ✂️ UX Paper Cuts 16.7 → Project page (#430244 - closed), #424396 (closed)