Add image url as configuration parameter

...rc/main/kotlin/theodolite/execution/TheodoliteExecutor.kt

...te-quarkus/src/main/kotlin/theodolite/k8s/UC1Benchmark.kt

...arkus/src/main/resources/yaml/aggregation-deployment.yaml

...-quarkus/src/main/resources/yaml/aggregation-service.yaml

...dolite-quarkus/src/main/resources/yaml/jmx-configmap.yaml

...lite-quarkus/src/main/resources/yaml/service-monitor.yaml

theodolite-quarkus/src/main/resources/yaml/theodolite.yaml

...te-quarkus/src/main/resources/yaml/workloadGenerator.yaml