[V0 deprecation] Remove _VLLM_V1 suffixes from attention backend names (#25489)

Signed-off-by: Matthew Bonanni <mbonanni@redhat.com>
Signed-off-by: Matthew Bonanni <mbonanni001@gmail.com>

vllm/model_executor/warmup/kernel_warmup.py

@@ -42,7 +42,7 @@ def kernel_warmup(worker: "Worker"):
     # and is not a pooling model
     def _is_flashinfer_backend(backend):
         try:
-            return backend.get_name() == "FLASHINFER_VLLM_V1"
+            return backend.get_name() == "FLASHINFER"
         except NotImplementedError:
             return False