Werk #6918: Availability: Time format is not only affected by time range

In case a availability is displaying a single day time range, the times of the single entries are formatted without date information.

In case there are annotations or downtimes that affect multiple days the from and until columns also only showed the start or end time instead of the date. This was some kind of misleading when trying to understand why such a downtime matched a given period.

CMK-1353

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