Fix PostCommit Python Xlang IO Dataflow job (#35131)

* Add support for iterable type

* Fix formatting

Author: Amar3tto

sdks/python/apache_beam/coders/row_coder.py

@@ -161,6 +161,9 @@ def _nonnull_coder_from_type(field_type):
       return BytesCoder()
   elif type_info == "array_type":
     return IterableCoder(_coder_from_type(field_type.array_type.element_type))
+  elif type_info == "iterable_type":
+    return IterableCoder(
+        _coder_from_type(field_type.iterable_type.element_type))
   elif type_info == "map_type":
     return MapCoder(
         _coder_from_type(field_type.map_type.key_type),

sdks/python/apache_beam/typehints/schemas.py

@@ -538,6 +538,10 @@ def typing_from_runner_api(
         return LogicalType.from_runner_api(
             fieldtype_proto.logical_type).language_type()
 
+    elif type_info == "iterable_type":
+      return Sequence[self.typing_from_runner_api(
+          fieldtype_proto.iterable_type.element_type)]
+
     else:
       raise ValueError(f"Unrecognized type_info: {type_info!r}")