Werk #14687: Fixed JSON encoding outside the BMP for Livestatus

Component	Livestatus
Title	Fixed JSON encoding outside the BMP for Livestatus
Date	Dec 2, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p18 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Livestatus used an incorrect way of encoding Unicode characters outside of the Basic Multilingual Plane (BMP) for the JSON output format. This affected characters like e.g. emojis, various symbols, characters from ancient languages, etc.

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