[SPARK-48058][SPARK-43727][PYTHON][CONNECT][TESTS][FOLLOWUP] Code clean up

[zhengruifeng]

What changes were proposed in this pull request?

after #46300, the two tests are actually the same as

spark/python/pyspark/sql/tests/pandas/test_pandas_udf.py

Lines 110 to 125 in 678aeb7

	def test_pandas_udf_decorator_with_return_type_string(self):
	schema = StructType([StructField("v", DoubleType())])
	@pandas_udf("v double", PandasUDFType.GROUPED_MAP)
	def foo(x):
	return x
	self.assertEqual(foo.returnType, schema)
	self.assertEqual(foo.evalType, PythonEvalType.SQL_GROUPED_MAP_PANDAS_UDF)
	@pandas_udf(returnType="double", functionType=PandasUDFType.SCALAR)
	def foo(x):
	return x
	self.assertEqual(foo.returnType, DoubleType())
	self.assertEqual(foo.evalType, PythonEvalType.SQL_SCALAR_PANDAS_UDF)

and

spark/python/pyspark/sql/tests/pandas/test_pandas_udf.py

Lines 55 to 70 in 678aeb7

	def test_pandas_udf_basic_with_return_type_string(self):
	udf = pandas_udf(lambda x: x, "double", PandasUDFType.SCALAR)
	self.assertEqual(udf.returnType, DoubleType())
	self.assertEqual(udf.evalType, PythonEvalType.SQL_SCALAR_PANDAS_UDF)
	udf = pandas_udf(lambda x: x, "v double", PandasUDFType.GROUPED_MAP)
	self.assertEqual(udf.returnType, StructType([StructField("v", DoubleType())]))
	self.assertEqual(udf.evalType, PythonEvalType.SQL_GROUPED_MAP_PANDAS_UDF)
	udf = pandas_udf(lambda x: x, "v double", functionType=PandasUDFType.GROUPED_MAP)
	self.assertEqual(udf.returnType, StructType([StructField("v", DoubleType())]))
	self.assertEqual(udf.evalType, PythonEvalType.SQL_GROUPED_MAP_PANDAS_UDF)
	udf = pandas_udf(lambda x: x, returnType="v double", functionType=PandasUDFType.GROUPED_MAP)
	self.assertEqual(udf.returnType, StructType([StructField("v", DoubleType())]))
	self.assertEqual(udf.evalType, PythonEvalType.SQL_GROUPED_MAP_PANDAS_UDF)

So no need to override them in the parity tests

Why are the changes needed?

clean up

Does this PR introduce any user-facing change?

no, test only

How was this patch tested?

ci

Was this patch authored or co-authored using generative AI tooling?

no

[zhengruifeng]

merged to master