With Echo we have the option of setting how we want to be notified about most events. Importantly we can choose if we want the notification delivered via web, email or both through mw-prefsection-echo. The exception to this are watchlist notifications where we can choose to have these notifications delivered as email on mw-prefsection-personal but we cannot chose to have them delivered as a web notification.
For new contributors this leads to some confusion as there is no reason to see the watchlist email notifications as any different from other notifications. Infrastructure wise it means we have to maintain two separate notification pipelines.
==== Acceptance criteria
[x] Two watchlist email notification checkboxes (`Email me when a page or a file on my watchlist is changed` and `Email me also for minor edits of pages and files`) have been moved from the the #mw-prefsection-echo in Special:Preferences to #mw-prefsection-notifications with the additional Web and Apps notification options.
[ ] Watchlist changes are added to the "Notices" section on the web echo notifications.
[ ] Use the `Watchlist` star icon in the [[ https://doc.wikimedia.org/oojs-ui/master/demos/?page=icons&theme=wikimediaui&direction=ltr&platform=desktop | OOUI icon set ]] as the notification icon.
[ ] The icon is in the Accent50 blue colour (per Notification design guidelines [[ https://www.mediawiki.org/wiki/Notifications/Design_guide#Icon_colors | here ]] for 'update' type notifications)