Werk #18707: introduction of user messages acknowledge and delete endpoints

Component	REST API
Title	introduction of user messages acknowledge and delete endpoints
Date	Sep 29, 2025
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

This werk introduces acknowledge and delete endpoints to the API unstable version.

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