[2.3.0] Checkmk Werk 16593 created: jenkins_nodes: Fix handling of multi-label nodes

[//]: # (werk v2) # jenkins_nodes: Fix handling of multi-label nodes key | value ---------- | --- date | 2024-06-12T14:31:49+00:00 version | 2.3.0p7 class | fix edition | cre component | checks level | 1 compatible | yes When using the Jenkins node check in an environment that had multiple labels assigned to a build node, the detection of busy and idle executors and the mode had been wrong. This werk fixes the way this data is obtained and should produce the expected values.