[scheduler][joy] Limit the amount of visible events in the Day Grid based components and add a "show all" toggle UI

[flaviendelangle]

Follow up on #17713

When many events are rendered in a Day Grid based component (the month view, the all-day UI for the week and day views), it can take a lot of space at the top of the Event Calendar or even overflow if the height is limited.

In this PR:

• Add a new prop to determine the max amount of all-day event to render by default
• Add a UI to show more events (should probably be an expand / collapse toggle for the MVP)

Not in this PR:

• Allow to build a custom UI to show more all-day events

MobiScroll (Popover):

Toast UI (expand / collapse):