Remove default values from InitVars so that they're not stored (#29859)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>
(cherry picked from commit 951445a52d)

tests/v1/attention/utils.py

@@ -185,6 +185,8 @@ def create_vllm_config(
         max_num_seqs=max_num_seqs,
         max_num_batched_tokens=max_num_batched_tokens,
         enable_chunked_prefill=enable_chunked_prefill,
+        max_model_len=model_config.max_model_len,
+        is_encoder_decoder=model_config.is_encoder_decoder,
     )
 
     device_config = DeviceConfig()