redis: add support for warm on init flag for redis cluster (#26027)

add support for warm on init flag for redis cluster

Signed-off-by: Rama Chavali <rama.rao@salesforce.com>

Mirrored from https://github.com/envoyproxy/envoy @ bb546b0e65932a47d160b0b6e676f43381d6aa00

envoy/config/cluster/v3/cluster.proto

@@ -1010,7 +1010,8 @@ message Cluster {
 
   // Optional configuration for having cluster readiness block on warm-up. Currently, only applicable for
   // :ref:`STRICT_DNS<envoy_v3_api_enum_value_config.cluster.v3.Cluster.DiscoveryType.STRICT_DNS>`,
-  // or :ref:`LOGICAL_DNS<envoy_v3_api_enum_value_config.cluster.v3.Cluster.DiscoveryType.LOGICAL_DNS>`.
+  // or :ref:`LOGICAL_DNS<envoy_v3_api_enum_value_config.cluster.v3.Cluster.DiscoveryType.LOGICAL_DNS>`,
+  // or :ref:`Redis Cluster<arch_overview_redis>`.
   // If true, cluster readiness blocks on warm-up. If false, the cluster will complete
   // initialization whether or not warm-up has completed. Defaults to true.
   google.protobuf.BoolValue wait_for_warm_on_init = 54;