Werk #15607: Reduce occurences of Missing data

The Check_MK service often showed the message

[piggyback] Missing data WARN

before a piggyback host was deleted. This lead to many false alarms in dynamic environments such as Kubernetes. The root cause of this was that the delete-hosts automation would delete piggyback files, which where still in use. With this Werk, the piggyback files are cleaned up by Check_MK's dedicated housekeeping job (see Werk 5538).

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