[Fix](nereids) remove duplicate expr in grouping set

[feiniaofeiafei]

db reported a error " expression duplicate in grouping set" when there are duplicate expression in grouping set.
e.g.select a from mal_test1 group by grouping sets((a,a))
This pr removes duplicate expr in grouping set :
select a from mal_test1 group by grouping sets((a))

[doris-robot]

Thank you for your contribution to Apache Doris.
Don't know what should be done next? See How to process your PR

[feiniaofeiafei]

run buildall

[github-actions]

PR approved by at least one committer and no changes requested.

[github-actions]

PR approved by anyone and no changes requested.

[doris-robot]

TPC-H: Total hot run time: 38466 ms

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/tpch-tools
Tpch sf100 test result on commit bccc8bfd8b1138b1fbdf8970d5a8415fac742b65, data reload: false

------ Round 1 ----------------------------------
q1	17655	4438	4110	4110
q2	2026	150	152	150
q3	10685	1127	898	898
q4	7463	710	734	710
q5	7470	2608	2639	2608
q6	185	123	122	122
q7	1203	823	815	815
q8	9332	2045	2019	2019
q9	7125	6471	6406	6406
q10	8444	3561	3647	3561
q11	421	227	214	214
q12	631	310	306	306
q13	17798	2863	2840	2840
q14	273	242	253	242
q15	492	466	456	456
q16	484	398	399	398
q17	969	560	529	529
q18	7330	6670	6549	6549
q19	5606	1502	1396	1396
q20	551	296	285	285
q21	6195	3544	3580	3544
q22	365	324	308	308
Total cold run time: 112703 ms
Total hot run time: 38466 ms

----- Round 2, with runtime_filter_mode=off -----
q1	4166	4071	4068	4068
q2	325	229	222	222
q3	2997	2832	2812	2812
q4	1851	1552	1542	1542
q5	5208	5250	5237	5237
q6	197	116	115	115
q7	2259	1824	1808	1808
q8	3156	3299	3307	3299
q9	8595	8596	8541	8541
q10	3747	3604	3650	3604
q11	558	441	456	441
q12	730	523	570	523
q13	16904	2893	2833	2833
q14	286	245	269	245
q15	480	448	447	447
q16	449	418	408	408
q17	1751	1504	1467	1467
q18	7507	7231	7204	7204
q19	1843	1533	1517	1517
q20	1880	1690	1719	1690
q21	4771	4693	4729	4693
q22	539	440	444	440
Total cold run time: 70199 ms
Total hot run time: 53156 ms