[2.3.0] Checkmk Werk 16588 created: time_periods: Fix timeperiod iCalendar (ics) import

[//]: # (werk v2) # time_periods: Fix timeperiod iCalendar (ics) import key | value ---------- | --- date | 2024-04-17T09:19:29+00:00 version | 2.3.0b6 class | fix edition | cre component | wato level | 1 compatible | yes This Werk solves a problem with importing events that take more than one day. Before this Werk, only the first day of the event was imported. Now all days involved are imported.