[Hybrid allocator + kv connector] revert connector test changes related to hybrid allocator (#28011)

Signed-off-by: KuntaiDu <kuntai@uchicago.edu>

tests/v1/core/utils.py

@@ -46,7 +46,6 @@ def create_scheduler(
     num_speculative_tokens: int | None = None,
     skip_tokenizer_init: bool = False,
     async_scheduling: bool = False,
-    disable_hybrid_kv_cache_manager: bool = False,
 ) -> Scheduler | AsyncScheduler:
     """Create scheduler under test.
 
@@ -71,7 +70,6 @@ def create_scheduler(
         disable_chunked_mm_input=disable_chunked_mm_input,
         enable_chunked_prefill=True,
         async_scheduling=async_scheduling,
-        disable_hybrid_kv_cache_manager=disable_hybrid_kv_cache_manager,
     )
     model_config = ModelConfig(
         model=model,