Merge CtaDrawer with EditorOverlay Anonwarning for anonymous editors

If anonymous editing is enabled, minimize the clicks for the user to
see the editor:
- Remove CtaDrawer not logged in users
- Merge contents from CtaDrawer into EditorOverlay (login, signup and
edit w/o login link)

All required elements (editor anon warning and Cta for login/signup) are
still present.

Bug: 72852
Change-Id: I8b42650df239c6fffde6a1bca0d2b152972d3141
Merge "Merge CtaDrawer with EditorOverlay Anonwarning for anonymous editors"