Change calendar owner via Web UI

[stefan-niedermann]

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Is your feature request related to a problem? Please describe. Given a user creates a calendar and shares this by link publicly. When the user account gets deleted, the calendar is lost and all people who subscribed to it won't get notified properly.

Describe the solution you'd like Being able to transfer a calendar (= changing the owner of the calendar) analogous to files as described in the user manual via the Web UI.

Describe alternatives you've considered A corresponding occ command has already been implemented as requested (see https://github.com/nextcloud/server/pull/5881). However, it is not reachable from the UI and therefore not applicable for shared hosters or managed Nextcloud instances.