Redirect API requests to moved projects

Summary

When a project is moved and being accessed by the old full pathour API returns 404. However, we should redirect the user to the up-to-date link.

This commit:

• When a request is GET, finds a project and takes redirect routes into account
• If the specified full path is not equal to the current full path, 301 (Moved permanently) is returned with Location set as a header
• The Location header contains the new url that specifies id

Test

• Create a project
• Move it to another namespace or rename it
• Access it via API using the old full path http://gdk.test:3000/api/v4/projects/root%2Fold-path or http://gdk.test:3000/api/v4/projects/root%2Fold-path/repository/files/files%2Ffile\?ref\=main
• 301 status is returned with new location, something like http://gdk.test:3000/api/v4/projects/12 or http://gdk.test:3000/api/v4/projects/12/repository/files/files%2Ffile\?ref\=main