fix: add type hint for public property name (Azure#30101)

Author: elliotzh

sdk/ml/azure-ai-ml/azure/ai/ml/entities/_builders/base_node.py

@@ -187,7 +187,7 @@ def __init__(
         self._init = False
 
     @property
-    def name(self):
+    def name(self) -> str:
         """Name of the node."""
         return self._name