[IMP] website_event(_track)_online: improve pages and menus management

RATIONALE

Events are sometimes held online, gathering a community. In this merge we
improve Event application to better support full-online events with improved
tracks, wishlists, chat rooms, ...

PURPOSE

Improve menu generation, linked to website_event and website_event_track.
Also remove frontend menu management, getting back backend management.

SPECIFICATIONS: MENU GENERATION

Add sequence to menus, allowing to ensure order of menus. This is done through
an override of some methods, leading to a transparent modification of behavior.

SPECIFICATIONS: MENU MANAGEMENT

Remove front-end menu management. Keep only the global "website menu" customize
option. Indeed it is quite slow and clutters the frontend management UI.

Get fields back on event and event type backend views. Put them in group noone
to avoid having too much fields on form view while allowing to thune them.

JS and code allowing to manage through frontend is simply de-activated in this
commit. That way existing use of website_event(_track) is not impacted by this
commit.

LINKS

Community PR #53540
Enterprise PR odoo/enterprise#11384

Task ID-2252655 (Main Online Event task)
Task ID-2283796 (Event B2Basics / Registration Flow)

Co-Authored-By: Aurélien Warnon <awa@odoo.com>
Co-Authored-By: David Beguin <dbe@odoo.com>
Co-Authored-By: Thibault Delavallée <tde@odoo.com>

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