fix: use --cconfig for coordinator cluster config

[mattisonchao]

Motivation

• stop wiring cluster config through the coordinator server config file
• rely on the coordinator configmap watch path directly instead of mounting the cluster config into the pod

Modifications

• remove cluster.configPath from coordinator.yaml
• pass --cconfig=configmap:<namespace>/<release>-coordinator to the coordinator
• keep coordinator using --sconfig for server settings and --profile when pprofEnabled is set
• remove the extra coordinator cluster-config volume mount from the pod

Testing

• helm template test-release charts/oxia-cluster