Allow clearing reminders on files

[Pytal]

The clear reminder action should be available if a reminder exists

On 27:

Not sure about implementation as FileAction enabled() is not awaitable

Previously a request was made to the backend to check if a reminder was set

server/apps/files_reminders/src/main.ts

Line 57 in 6250c7d

dueDate = (await getReminder(fileId)).dueDate

[Pytal]

Any ideas on how we could go about this would be much appreciated @skjnldsv :)

[skjnldsv]

Just add a dedicated action ?
You can do the request in the enabled async method, or (better), have the reminder be present as a dav attribute ?

[XueSheng-GIT]

@Pytal I'm on NC 28.0.2 and once a reminder is set, I cannot even see whether a reminder is set or not (there is no such indication). Is this part and covered by this issue?

[Pytal]

No, that is not covered by this issue @XueSheng-GIT but I will do that in a followup

Tracking in #43540