[Auto Sync] Rename is_hybrid to is_hybrid_swa (#14252)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Hanming Lu <69857889+hanming-lu@users.noreply.github.com>
Co-authored-by: Hanming Lu <hanming@x.ai>

test/nightly/test_nsa_indexer.py

@@ -108,7 +108,7 @@ class MockModelRunner:
         self.config = {**DEFAULT_CONFIG, **(config or {})}
         self.dtype = self.config["dtype"]
         self.kv_cache_dtype = self.config["kv_cache_dtype"]
-        self.is_hybrid = False
+        self.is_hybrid_swa = False
 
         # Model configuration
         attention_arch = AttentionArch.MLA