Werk #17275: Introduce cmk/customer host label

Component	User interface
Title	Introduce cmk/customer host label
Date	Sep 5, 2024
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.4.0b1 Checkmk MSP (CME)

The MSP edition will now create a cmk/customer label for each host.

This label can be used to configure filters based on customers.

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