Issue Summary

When using Team Calendars, it's possible to have different events from different types under one Calendar. However, it is not possible to move/migrate these events and their types to another calendar.

The only possibility would be to export the calendar to ICS, and then import it. However, this approach is not good because it doesn't allow to choose which events would be imported - the calendar would be entirely duplicated. Besides, as a reported on CONFCLOUD-70057, TC doesn't import custom event types, which means that all custom events would be under the same type.

Proposed Solution

Provide the ability to move event and their types from one calendar to another on TC UI.