[VL] Remove an out-of-date warning message

[zhztheplayer]

This is a follow-up minor fix for #7845.

Enabling Velox background IO thread now no longer causes hanging or dead lock issues. Remove the related warning message which could be misleading for users.

Also, simplify gluten-it option --collect-sql-metrics which is introduced in #8445 to --sql-metrics.

[zhli1142015]

LGTM, thanks

[github-actions]

Run Gluten Clickhouse CI on x86

[github-actions]

Run Gluten Clickhouse CI on x86

[GlutenPerfBot]

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

query	log/native_master_01_07_2025_time.csv	log/native_master_01_07_2025_af559452a8_time.csv	difference	percentage
q1	16.14	15.47	-0.665	95.88%
q2	17.02	16.61	-0.412	97.58%
q3	2.90	4.97	2.076	171.65%
q4	85.45	81.68	-3.767	95.59%
q5	12.79	12.30	-0.490	96.17%
q6	4.60	4.98	0.383	108.34%
q7	6.73	8.31	1.575	123.39%
q8	4.81	4.46	-0.352	92.69%
q9	28.44	27.04	-1.396	95.09%
q10	12.79	13.35	0.558	104.36%
q11	42.52	42.13	-0.389	99.09%
q12	1.96	2.33	0.366	118.64%
q13	8.25	8.12	-0.130	98.42%
q14a	61.76	64.25	2.489	104.03%
q14b	58.31	56.48	-1.828	96.86%
q15	3.32	3.54	0.227	106.84%
q16	29.25	28.50	-0.757	97.41%
q17	7.73	7.58	-0.147	98.10%
q18	10.09	9.25	-0.836	91.71%
q19	3.68	3.72	0.041	101.11%
q20	2.39	2.66	0.272	111.41%
q21	1.50	1.52	0.022	101.45%
q22	9.23	9.71	0.473	105.12%
q23a	135.52	136.27	0.751	100.55%
q23b	163.30	164.80	1.503	100.92%
q24a	105.68	88.25	-17.433	83.50%
q24b	96.70	88.18	-8.518	91.19%
q25	6.50	6.62	0.127	101.96%
q26	3.98	4.95	0.971	124.39%
q27	4.58	5.13	0.552	112.07%
q28	37.08	38.09	1.013	102.73%
q29	17.48	16.86	-0.612	96.50%
q30	6.63	6.05	-0.571	91.38%
q31	10.65	11.03	0.378	103.55%
q32	2.08	3.54	1.462	170.37%
q33	7.52	6.89	-0.638	91.53%
q34	4.27	7.10	2.831	166.27%
q35	12.20	10.46	-1.735	85.78%
q36	5.41	5.52	0.107	101.97%
q37	5.32	5.26	-0.055	98.97%
q38	18.16	18.02	-0.146	99.20%
q39a	4.47	5.01	0.542	112.14%
q39b	5.05	4.76	-0.292	94.21%
q40	6.29	5.10	-1.190	81.09%
q41	0.89	0.90	0.015	101.71%
q42	1.51	1.18	-0.334	77.95%
q43	4.50	4.64	0.143	103.18%
q44	12.47	11.80	-0.671	94.62%
q45	4.19	5.50	1.309	131.26%
q46	5.78	5.36	-0.419	92.76%
q47	20.34	19.89	-0.450	97.79%
q48	6.78	6.65	-0.130	98.08%
q49	11.00	10.16	-0.845	92.32%
q50	38.42	35.97	-2.449	93.63%
q51	14.67	14.85	0.186	101.27%
q52	1.38	1.29	-0.093	93.27%
q53	3.31	3.06	-0.256	92.28%
q54	6.80	7.13	0.336	104.95%
q55	1.28	1.42	0.140	110.88%
q56	7.13	7.11	-0.020	99.72%
q57	13.29	12.59	-0.703	94.71%
q58	3.43	3.35	-0.087	97.47%
q59	7.14	6.98	-0.158	97.79%
q60	8.96	8.87	-0.089	99.00%
q61	7.73	9.00	1.270	116.44%
q62	5.09	5.47	0.378	107.43%
q63	3.20	3.22	0.021	100.65%
q64	62.56	62.39	-0.173	99.72%
q65	29.84	30.33	0.498	101.67%
q66	4.31	4.36	0.056	101.30%
q67	228.28	233.24	4.961	102.17%
q68	4.47	3.98	-0.490	89.04%
q69	7.78	6.71	-1.074	86.20%
q70	13.06	12.88	-0.178	98.63%
q71	6.04	5.65	-0.388	93.58%
q72	38.45	38.28	-0.173	99.55%
q73	3.45	3.11	-0.342	90.10%
q74	26.70	26.51	-0.193	99.28%
q75	43.85	40.96	-2.895	93.40%
q76	14.17	14.95	0.780	105.51%
q77	4.13	4.25	0.120	102.90%
q78	84.42	84.76	0.341	100.40%
q79	5.28	5.71	0.433	108.21%
q80	16.95	17.20	0.247	101.46%
q81	8.49	7.82	-0.664	92.17%
q82	10.13	10.28	0.151	101.49%
q83	2.58	2.75	0.166	106.43%
q84	3.59	3.70	0.108	103.00%
q85	9.86	9.83	-0.035	99.64%
q86	4.57	4.88	0.311	106.81%
q87	18.85	18.13	-0.717	96.19%
q88	23.24	23.25	0.009	100.04%
q89	4.68	4.34	-0.336	92.81%
q90	3.30	3.24	-0.057	98.26%
q91	5.51	5.07	-0.438	92.05%
q92	2.15	2.11	-0.037	98.30%
q93	54.10	52.80	-1.296	97.60%
q94	16.93	17.49	0.558	103.30%
q9	97.68	151.61	53.925	155.20%
q5	3.01	5.56	2.553	184.75%
q96	28.58	28.13	-0.446	98.44%
q97	2.75	5.02	2.266	182.29%
q98	10.63	10.59	-0.035	99.67%
q99	10.63	10.59	-0.035	99.67%
total	2184.16	2215.13	30.976	101.42%