[Misc] Remove deprecated code (#12383)

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>

vllm/engine/arg_utils.py

@@ -100,7 +100,6 @@ class EngineArgs:
     kv_cache_dtype: str = 'auto'
     seed: int = 0
     max_model_len: Optional[int] = None
-    worker_use_ray: bool = False
     # Note: Specifying a custom executor backend by passing a class
     # is intended for expert use only. The API may change without
     # notice.
@@ -389,10 +388,6 @@ class EngineArgs:
             'to "ray" if Ray is installed and fail otherwise. Note that tpu '
             'only supports Ray for distributed inference.')
 
-        parser.add_argument(
-            '--worker-use-ray',
-            action='store_true',
-            help='Deprecated, use ``--distributed-executor-backend=ray``.')
         parser.add_argument('--pipeline-parallel-size',
                             '-pp',
                             type=int,
@@ -1071,7 +1066,6 @@ class EngineArgs:
         parallel_config = ParallelConfig(
             pipeline_parallel_size=self.pipeline_parallel_size,
             tensor_parallel_size=self.tensor_parallel_size,
-            worker_use_ray=self.worker_use_ray,
             max_parallel_loading_workers=self.max_parallel_loading_workers,
             disable_custom_all_reduce=self.disable_custom_all_reduce,
             tokenizer_pool_config=TokenizerPoolConfig.create_config(