Remove ZooKeeper client, which is no longer needed

execution/helm/theodolite-chart/templates/zookeeper-client.yaml

-{{- if .Values.zookeeperClient.enabled -}}
-apiVersion: v1
-kind: Pod
-metadata:
-  # name: {{ template "theodolite.fullname" . }}-zookeeper-client
-  name: zookeeper-client
-spec:
-  containers:
-  - name: zookeeper-client
-    image: confluentinc/cp-zookeeper:5.4.0
-    command:
-      - sh
-      - -c
-      - "exec tail -f /dev/null"
-  {{- with .Values.zookeeperClient.nodeSelector }}
-  nodeSelector:
-    {{- toYaml . | nindent 8 }}
-  {{- end }}
-{{- end}}