chore: simplify embedded frontend UI

[korniltsev]

• Remove a lot of unused UI code (authorization, api keys, adhoc, settings, tag explorer)
• Remove some of UI (diff, compare), leave only single flame graph page. I assume not a lot of people use diff and compare , so I propose to sacrifice them.
• Remove tests and test dependencies. I mostly propose to do this to have less dependencies and less "security" updates.
• Drastically reduces the redux state, should simplify updates/migrations there in the future.

This draft is just an RFC - attempt to improve and simplify our maintenance of embedded frontend. Curious what others think of my assumptions 🧠 and sacrifices 🗡️

[simonswine]

Yes, I would support this effort!

[korniltsev]

This is how it would look