[core] Fix error for connecting to existing cluster from OSX/Windows …

…driver (#32646)

Removes an unnecessary check when connecting to the cluster. See #32640.

python/ray/_private/worker.py

@@ -1358,11 +1358,6 @@ def init(
     if bootstrap_address is not None:
         gcs_address = bootstrap_address
         logger.info("Connecting to existing Ray cluster at address: %s...", gcs_address)
-        if not ray_constants.env_set_by_user(ray_constants.ENABLE_RAY_CLUSTERS_ENV_VAR):
-            # If the cluster already exists, then assume it's safe to connect
-            # to the cluster even if we're on Windows or OSX (unless the user
-            # explicitly set the flag).
-            ray_constants.ENABLE_RAY_CLUSTER = True
 
     # NOTE(swang): We must set the node IP address *after* we determine whether
     # this is an existing cluster or not. For Windows and OSX, the resolved IP