Adjust Benchmark Definitions for Operator

Depends on !131 (merged), !139 (merged), !153 (merged)

This is just an early draft, for a final version, we need to address the following items:

• Replace installation via install-configmaps.sh script by according additions to the Helm chart
• Reduce the amount of configMaps --> abandoned (see #240 (closed))
• Allow for additional benchmark definitions

theodolite-benchmarks/definitions/uc4-flink/taskmanager-deployment.yaml

@@ -16,7 +16,7 @@ spec:
     spec:
       containers:
         - name: taskmanager
-          image: ghcr.io/cau-se/theodolite-uc3-flink:latest
+          image: ghcr.io/cau-se/theodolite-uc4-flink:latest
           env:
             - name: KAFKA_BOOTSTRAP_SERVERS
               value: "theodolite-cp-kafka:9092"