[Chore] Remove SupportsV0Only interface and update supported models docs (#26783)

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

vllm/engine/arg_utils.py

@@ -1606,13 +1606,6 @@ class EngineArgs:
             )
             return False
 
-        # No Mamba or Encoder-Decoder so far.
-        if not model_config.is_v1_compatible:
-            _raise_or_fallback(
-                feature_name=model_config.architectures, recommend_to_remove=False
-            )
-            return False
-
         # No Concurrent Partial Prefills so far.
         if (
             self.max_num_partial_prefills != SchedulerConfig.max_num_partial_prefills