[2.3.0] Checkmk Werk 16474 created: Revert Werk #16473 and export labels comma separated lists instead

[//]: # (werk v2) # Revert Werk #16473 and export labels comma separated lists instead key | value ---------- | --- date | 2024-02-20T13:34:55+00:00 version | 2.3.0b1 class | fix edition | cre component | multisite level | 1 compatible | yes This change reverts [Werk #16473](https://checkmk.com/werk/16473) and instead implements the <2.2 behaviour for labels in CSV exports.