branch-3.0: [fix](mysql protocol)Set more stmt exists flag correctly when forward to master. (#55711)

[Jibing-Li]

backport: #55711

[Thearas]

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

Please clearly describe your PR:

1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
3. What features were added. Why was this function added?
4. Which code was refactored and why was this part of the code refactored?
5. Which functions were optimized and what is the difference before and after the optimization?

[Jibing-Li]

run buildall

[doris-robot]

Cloud UT Coverage Report

Increment line coverage 🎉

Increment coverage report
Complete coverage report

Category	Coverage
Function Coverage	80.98% (1179/1456)
Line Coverage	65.33% (20377/31190)
Region Coverage	66.94% (10274/15348)
Branch Coverage	56.58% (5429/9596)

[doris-robot]

TPC-H: Total hot run time: 40132 ms

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/tpch-tools
Tpch sf100 test result on commit ef2e8d4d728011aa81b715b7b58f74c22b6a76f6, data reload: false

------ Round 1 ----------------------------------
q1	17633	7032	6664	6664
q2	2040	177	185	177
q3	10619	1164	1186	1164
q4	10421	808	750	750
q5	7787	2920	2801	2801
q6	216	134	135	134
q7	975	624	627	624
q8	9369	2000	2048	2000
q9	6774	6387	6475	6387
q10	7006	2286	2333	2286
q11	461	266	264	264
q12	406	217	214	214
q13	17795	2956	2978	2956
q14	224	202	200	200
q15	511	455	462	455
q16	453	376	379	376
q17	993	636	588	588
q18	7232	6689	6639	6639
q19	1420	1069	1047	1047
q20	477	208	214	208
q21	3968	3263	3211	3211
q22	1122	1012	987	987
Total cold run time: 107902 ms
Total hot run time: 40132 ms

----- Round 2, with runtime_filter_mode=off -----
q1	6628	6611	6557	6557
q2	337	226	235	226
q3	2949	2957	2977	2957
q4	2084	1903	1817	1817
q5	5798	5761	5759	5759
q6	219	135	132	132
q7	2194	1846	1817	1817
q8	3376	3659	3475	3475
q9	8938	8987	8882	8882
q10	3596	3544	3545	3544
q11	593	508	505	505
q12	810	662	621	621
q13	10318	3099	3211	3099
q14	320	267	262	262
q15	510	472	476	472
q16	503	440	443	440
q17	1876	1661	1623	1623
q18	8337	7845	7650	7650
q19	1681	1460	1683	1460
q20	2112	1894	1877	1877
q21	5331	5142	5023	5023
q22	1129	1030	1040	1030
Total cold run time: 69639 ms
Total hot run time: 59228 ms

[doris-robot]

BE UT Coverage Report

Increment line coverage 🎉

Increment coverage report
Complete coverage report

Category	Coverage
Function Coverage	42.10% (11245/26712)
Line Coverage	32.62% (96262/295071)
Region Coverage	30.56% (55287/180884)
Branch Coverage	26.88% (27362/101776)

[doris-robot]

TPC-DS: Total hot run time: 192978 ms

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/tpcds-tools
TPC-DS sf100 test result on commit ef2e8d4d728011aa81b715b7b58f74c22b6a76f6, data reload: false

query1	962	412	411	411
query2	6226	1936	1906	1906
query3	8699	201	198	198
query4	33906	23481	23575	23481
query5	3556	443	446	443
query6	276	181	178	178
query7	4197	315	316	315
query8	297	220	223	220
query9	9561	2581	2579	2579
query10	471	267	267	267
query11	18012	15034	15169	15034
query12	171	102	103	102
query13	1551	447	424	424
query14	9858	7074	7092	7074
query15	244	171	186	171
query16	7987	544	504	504
query17	1645	616	594	594
query18	2151	327	324	324
query19	312	168	176	168
query20	121	118	118	118
query21	214	110	112	110
query22	4969	4545	4680	4545
query23	34889	34545	34658	34545
query24	11758	2899	2947	2899
query25	670	438	428	428
query26	1225	176	170	170
query27	2707	351	362	351
query28	7424	2180	2184	2180
query29	877	463	470	463
query30	272	162	168	162
query31	1084	855	846	846
query32	94	60	56	56
query33	768	298	298	298
query34	1000	523	512	512
query35	903	748	752	748
query36	1110	952	958	952
query37	129	66	68	66
query38	4052	3904	3942	3904
query39	1551	1521	1470	1470
query40	210	104	103	103
query41	50	50	48	48
query42	129	106	109	106
query43	545	501	484	484
query44	1279	821	814	814
query45	192	165	175	165
query46	1183	725	769	725
query47	2102	1946	1960	1946
query48	493	382	379	379
query49	965	410	393	393
query50	833	426	440	426
query51	7431	7318	7278	7278
query52	109	90	90	90
query53	259	183	181	181
query54	1293	466	472	466
query55	81	79	76	76
query56	271	258	257	257
query57	1321	1227	1196	1196
query58	225	207	208	207
query59	3199	3110	3068	3068
query60	301	264	271	264
query61	113	110	121	110
query62	862	687	709	687
query63	231	194	189	189
query64	4283	704	652	652
query65	3308	3302	3302	3302
query66	922	299	323	299
query67	16253	15737	15659	15659
query68	4727	565	577	565
query69	454	272	293	272
query70	1186	1092	1085	1085
query71	353	249	249	249
query72	6323	4105	4089	4089
query73	773	343	356	343
query74	9753	9275	8776	8776
query75	3438	2653	2660	2653
query76	2682	997	1186	997
query77	418	285	279	279
query78	10562	9560	9591	9560
query79	2448	591	607	591
query80	1092	430	421	421
query81	550	215	219	215
query82	607	86	85	85
query83	233	152	139	139
query84	241	81	84	81
query85	1412	318	302	302
query86	453	294	305	294
query87	4394	4206	4260	4206
query88	4155	2399	2365	2365
query89	401	293	292	292
query90	1976	183	181	181
query91	206	150	149	149
query92	65	50	53	50
query93	2297	558	561	558
query94	773	306	281	281
query95	369	253	258	253
query96	607	277	279	277
query97	3327	3110	3183	3110
query98	227	191	199	191
query99	1502	1283	1324	1283
Total cold run time: 302346 ms
Total hot run time: 192978 ms

[doris-robot]

ClickBench: Total hot run time: 31.89 s

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/clickbench-tools
ClickBench test result on commit ef2e8d4d728011aa81b715b7b58f74c22b6a76f6, data reload: false

query1	0.03	0.03	0.03
query2	0.08	0.04	0.05
query3	0.23	0.06	0.05
query4	1.64	0.08	0.08
query5	0.53	0.52	0.50
query6	1.13	0.74	0.74
query7	0.02	0.02	0.02
query8	0.06	0.04	0.04
query9	0.56	0.49	0.50
query10	0.54	0.56	0.56
query11	0.17	0.13	0.12
query12	0.15	0.12	0.12
query13	0.60	0.60	0.59
query14	0.79	0.79	0.81
query15	0.86	0.84	0.82
query16	0.39	0.38	0.42
query17	1.03	1.08	1.08
query18	0.20	0.18	0.19
query19	1.82	1.82	1.72
query20	0.02	0.01	0.01
query21	15.40	0.67	0.67
query22	4.19	6.11	2.76
query23	18.29	1.41	1.28
query24	2.19	0.23	0.23
query25	0.15	0.08	0.09
query26	0.28	0.19	0.18
query27	0.08	0.08	0.07
query28	13.35	0.58	0.58
query29	12.64	3.43	3.43
query30	0.26	0.05	0.05
query31	2.86	0.41	0.41
query32	3.22	0.47	0.49
query33	2.99	3.02	3.04
query34	16.74	4.58	4.57
query35	4.67	4.65	4.62
query36	0.66	0.48	0.48
query37	0.19	0.17	0.16
query38	0.16	0.17	0.16
query39	0.05	0.04	0.04
query40	0.16	0.13	0.13
query41	0.09	0.05	0.05
query42	0.06	0.05	0.05
query43	0.05	0.04	0.04
Total cold run time: 109.58 s
Total hot run time: 31.89 s

[Jibing-Li]

run p0

[Jibing-Li]

run nonConcurrent

[Jibing-Li]

run nonConcurrent

[hello-stephen]

BE Regression && UT Coverage Report

Increment line coverage 100% (0/0) 🎉

Increment coverage report
Complete coverage report

Category	Coverage
Function Coverage	75.23% (19715/26205)
Line Coverage	68.46% (201114/293756)
Region Coverage	66.48% (120328/180988)
Branch Coverage	59.80% (61053/102100)

[hello-stephen]

BE Regression && UT Coverage Report

Increment line coverage 100% (0/0) 🎉

Increment coverage report
Complete coverage report

Category	Coverage
Function Coverage	75.23% (19715/26205)
Line Coverage	68.45% (201085/293756)
Region Coverage	66.48% (120327/180988)
Branch Coverage	59.79% (61050/102100)

[dataroaring]

LGTM