Werk #15555: host_tag: improve error message for delete endpoint

Component	REST API
Title	host_tag: improve error message for delete endpoint
Date	Mar 28, 2023
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0b2 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

This werk improves the error message when deleting a host tag group with the repair option. It now lists the dependencies of the host tag group which are preventing the deletion.

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