Code Insights: Remove legacy insights UI parts
Created by: vovakulikov
This is the first part of legacy part deprecation and deletion
This PR removes
- The setting-based analytics calls
- Code Insights extension like panels (we used to have them on the home and directory pages)
Test plan
- Make sure that we didn't delete anything that is still used anywhere in our product
App preview:
Check out the client app preview documentation to learn more.