chore(registry): remove registry_secret_prefix

Author: duanhongyi

charts/workflow/values.yaml

@@ -50,8 +50,6 @@ global:
   registry_location: "on-cluster"
   # The host port to which registry proxy binds to
   registry_service_port: 5555
-  # Prefix for the imagepull secret created when using private registry
-  registry_secret_prefix: "private-registry"
   # If the Kubernetes cluster uses CNI
   # use_cni: true
   # Set the `listen` variable for registry-proxy's NGINX