[VL] Add flushable decimal sum test case

[liujiayi771]

What changes were proposed in this pull request?

Add flushable decimal sum test case.

How was this patch tested?

Add new test case.

[liujiayi771]

cc @rui-mo, thanks.

[GlutenPerfBot]

===== Performance report for TPCH SF2000 with Velox backend, for reference only ====

query	log/native_4871_time.csv	log/native_master_03_06_2024_bddc3fd79_time.csv	difference	percentage
q1	35.44	38.77	3.332	109.40%
q2	23.90	24.36	0.452	101.89%
q3	36.49	39.60	3.105	108.51%
q4	37.70	37.58	-0.119	99.68%
q5	71.67	69.92	-1.744	97.57%
q6	7.57	8.34	0.764	110.09%
q7	85.78	84.40	-1.389	98.38%
q8	86.04	86.73	0.694	100.81%
q9	122.68	119.49	-3.192	97.40%
q10	46.24	43.18	-3.057	93.39%
q11	21.43	20.86	-0.570	97.34%
q12	24.49	28.05	3.567	114.57%
q13	48.09	44.55	-3.543	92.63%
q14	22.98	17.03	-5.946	74.12%
q15	31.34	28.15	-3.196	89.80%
q16	14.52	14.07	-0.449	96.91%
q17	103.09	101.46	-1.631	98.42%
q18	143.17	145.26	2.093	101.46%
q19	13.55	13.99	0.437	103.22%
q20	26.54	28.21	1.673	106.30%
q21	227.18	224.18	-3.000	98.68%
q22	13.87	14.99	1.114	108.03%
total	1243.78	1233.17	-10.604	99.15%