[FR] Support clearing/archiving upcoming notifications

[Xazin]

Description

Reported by Lucas:

Should we support clearing or removing the upcoming events?

Impact

• Don't receive notifications in case an upcoming event was handled "prematurely"/beforehand
• Being able to clean not only the "inbox" but also the "upcoming" tab, for organized users.

Additional Context

This requires thinking about "archiving", right now we have "deletion" behavior, but in the near future we will have "archiving" behavior.

Will "clearing upcoming events" be done on a single item basis, and can that simply be "Archive prematurely", or is it an "apply-for-all"-action and in that case what do we expect to happen?