gh-95913: Fix, sort & expand pending removal sect in 3.11 WhatsNew (GH-98583)

* Fix names/references of pending removal APIs

* Sort list of APIs pending removal alphabetically

* Add missing modules/submodules pending removal in 3.12

* Add table of unittest deprecated aliases to 3.11 What's New

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Co-authored-by: Petr Viktorin <encukou@gmail.com>