Move non time critical background tasks to maintenance window

[ChristophWurst]

Describe the task

With https://github.com/nextcloud/server/pull/30945 it will be possible to move background jobs to times where the server is less busy. We have some tasks that currently run at a fixed interval, where it might make sense to move them for the chance of yielding better performance. I'm thinking about the calendar resources sync for example.

Affected components

• [x] Calendar & Contacts backend https://github.com/nextcloud/server/pull/31316
  • BuildReminderIndexBackgroundJob
  • CalendarRetentionJob
  • CleanupDirectLinksJob
  • CleanupInvitationTokenJob
  • EventReminderJob
  • GenerateBirthdayCalendarBackgroundJob
  • RefreshWebcalJob
  • RegisterRegenerateBirthdayCalendars
  • UpdateCalendarResourcesRoomsBackgroundJob
  • UploadCleanup
• [x] Calendar https://github.com/nextcloud/calendar/pull/3974
  • CleanUpOutdatedBookingsJob
• [x] Contacts https://github.com/nextcloud/contacts/pull/2645
  • SocialUpdate
  • SocialUpdateRegistration
• [x] Mail https://github.com/nextcloud/mail/pull/6053
  • CleanupJob
  • MigrateImportantJob
  • SyncJob
  • TrainImportanceClassifierJob

To do

• [x] Find out which of our background jobs are not time critical
• [x] Move them

[tcitworld]

I suggested a list of non-important jobs above

[ChristophWurst]

not all heroes wear capes

[nickvergessen]

Server PR merged