[MLIR][Transform] Consolidate result of structured.split into one list (#111171)

Follow-up a review comment from
llvm/llvm-project#82792 (comment)
as a separate PR:

	E.g.:
	```
	%0:2 = transform.structured.split
	```
	is changed to
	```
	%t = transform.structured.split
	%0:2 = transform.split_handle %t
	```

Author: joeyye-work

mlir/python/mlir/dialects/transform/structured.py

@@ -445,7 +445,6 @@ def __init__(
             dynamic_chunk_sizes = chunk_sizes
 
         super().__init__(
-            target.type,
             target.type,
             target,
             dimension=dimension,