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

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

vllm/config/model.py

@@ -1622,10 +1622,6 @@ class ModelConfig:
     def has_inner_state(self):
         return self._model_info.has_inner_state
 
-    @property
-    def is_v1_compatible(self) -> bool:
-        return not self._model_info.supports_v0_only
-
     @property
     def use_mla(self) -> bool:
         return self.is_deepseek_mla and not envs.VLLM_MLA_DISABLE