[Model][Spec Decode] Nemotron-H MTP and Mamba Speculative Decoding Support (#33726)

Signed-off-by: Shahar Mor <smor@nvidia.com>
Signed-off-by: Benjamin Chislett <bchislett@nvidia.com>
Signed-off-by: Lucas Wilkinson <lwilkins@redhat.com>
Co-authored-by: Shahar Mor <smor@nvidia.com>
Co-authored-by: Roi Koren <roik@nvidia.com>
Co-authored-by: Lucas Wilkinson <lwilkins@redhat.com>

tests/models/registry.py

@@ -1200,6 +1200,11 @@ _SPECULATIVE_DECODING_EXAMPLE_MODELS = {
         },
         is_available_online=False,
     ),
+    "NemotronHMTPModel": _HfExamplesInfo(
+        "nvidia/Nemotron-Super-Placeholder",
+        speculative_model="nvidia/Nemotron-Super-Placeholder",
+        is_available_online=False,
+    ),
 }
 
 _TRANSFORMERS_BACKEND_MODELS = {