Werk #14127: KUBE agent_kube: Option Cluster resource aggregation matches inline help

Previously, if the option 'Cluster resource aggregation' was used to exclude Nodes based on their roles, the performed search would be a prefix search. This was inconsistent with the inline help, which promises an infix search. With this werk, an infix search is now performed by the agent. Those users who have configured the option 'Cluster resource aggregation' to be sensitive to the type of regex matching performed need to verify that the agent is still performing as expected.

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