Add support for Mistral Large 3 inference with Flashinfer MoE (#33174)

Signed-off-by: Dimitrios Bariamis <12195802+dbari@users.noreply.github.com>
Co-authored-by: Dimitrios Bariamis <12195802+dbari@users.noreply.github.com>
Co-authored-by: Cyrus Leung <tlleungac@connect.ust.hk>

tests/kernels/moe/test_flashinfer.py

@@ -135,6 +135,8 @@ class TestData:
                 layer.w2_input_scale,
             )
         layer.custom_routing_function = Llama4MoE.custom_routing_function
+        layer.routing_method_type = RoutingMethodType.Llama4
+        layer.renormalize = False
         layer.intermediate_size_per_partition = n
         layer.ep_rank = 0
         layer.local_num_experts = e