[data] Fix MapTransformFn __eq__ (#51434)

## Why are these changes needed?

<!-- Please give a short summary of the change and the problem this
solves. -->
Fix `MapTransformFn` `__eq__` for below by also testing for `_is_udf`.
* `RowMapTransformFn`
* `BatchMapTransformFn`
* `RowToBlockMapTransformFn`

Signed-off-by: Srinath Krishnamachari <srinath.krishnamachari@anyscale.com>

Author: srinathk10

python/ray/data/_internal/execution/operators/map_transformer.py

@@ -305,7 +305,11 @@ def __repr__(self) -> str:
         return f"RowMapTransformFn({self._row_fn})"
 
     def __eq__(self, other):
-        return isinstance(other, RowMapTransformFn) and self._row_fn == other._row_fn
+        return (
+            isinstance(other, RowMapTransformFn)
+            and self._row_fn == other._row_fn
+            and self._is_udf == other._is_udf
+        )
 
 
 class BatchMapTransformFn(MapTransformFn):
@@ -332,7 +336,9 @@ def __repr__(self) -> str:
 
     def __eq__(self, other):
         return (
-            isinstance(other, BatchMapTransformFn) and self._batch_fn == other._batch_fn
+            isinstance(other, BatchMapTransformFn)
+            and self._batch_fn == other._batch_fn
+            and self._is_udf == other._is_udf
         )
 
 
@@ -357,6 +363,7 @@ def __eq__(self, other):
         return (
             isinstance(other, RowToBlockMapTransformFn)
             and self._transform_fn == other._transform_fn
+            and self._is_udf == other._is_udf
         )