This update removes outdated setup instructions that controlled whether form screens opened in view or edit mode. Since forms now always open ready for editing, the cleanup keeps related apps aligned with the newer behavior and reduces maintenance risk without changing business workflows.

This commit is the counterpart of odoo/odoo#115172, where we drop the support of the form_view_initial_mode key in context, form views being always in edition now. In this commit, we clean up contexts containing that key.

Part of task 3179751