[core]Turn on light weight resource broadcasting. (ray-project#32625)

This PR turns on light weight resource broadcasting. It's the last piece of the work. Please refer to [doc](https://docs.google.com/document/d/1bmLARyChhAtWUWsppdqa-9O7kW3X7ZRJOCPIfbIXpZw/edit?usp=sharing) for the details.

Signed-off-by: Jack He <[email protected]>

src/ray/common/ray_config_def.h

@@ -440,7 +440,7 @@ RAY_CONFIG(uint64_t, gcs_grpc_max_request_queued_max_bytes, 1024UL * 1024 * 1024
 RAY_CONFIG(int32_t, gcs_client_check_connection_status_interval_milliseconds, 1000)
 
 /// Feature flag to use the ray syncer for resource synchronization
-RAY_CONFIG(bool, use_ray_syncer, false)
+RAY_CONFIG(bool, use_ray_syncer, true)
 /// Due to the protocol drawback, raylet needs to refresh the message if
 /// no message is received for a while.
 /// Refer to https://tinyurl.com/n6kvsp87 for more details