[VL] Set default validation log level to WARN

[yma11]

What changes were proposed in this pull request?

Set default validation log level from INFO to WARN.

How was this patch tested?

N/A

[github-actions]

Thanks for opening a pull request!

Could you open an issue for this pull request on Github Issues?

https://github.com/apache/incubator-gluten/issues

Then could you also rename commit message and pull request title in the following format?

[GLUTEN-${ISSUES_ID}][COMPONENT]feat/fix: ${detailed message}

See also:

• Other pull requests

[github-actions]

Run Gluten Clickhouse CI

[yma11]

@FelixYBW FYI. Thanks.

[FelixYBW]

Oh, we already have a config while I didn't noted. Thank you!

[GlutenPerfBot]

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

query	log/native_master_08_01_2024_time.csv	log/native_master_07_31_2024_0ed44a4289_time.csv	difference	percentage
q1	39.31	40.49	1.183	103.01%
q2	29.53	30.38	0.852	102.88%
q3	54.54	53.36	-1.177	97.84%
q4	41.78	41.93	0.155	100.37%
q5	105.12	105.75	0.639	100.61%
q6	12.79	11.50	-1.289	89.92%
q7	116.82	116.91	0.092	100.08%
q8	113.59	116.05	2.463	102.17%
q9	169.30	168.38	-0.928	99.45%
q10	65.98	65.81	-0.161	99.76%
q11	27.92	26.76	-1.159	95.85%
q12	29.66	29.20	-0.458	98.46%
q13	51.37	51.79	0.421	100.82%
q14	23.87	25.72	1.842	107.72%
q15	54.56	53.02	-1.541	97.18%
q16	18.94	20.31	1.372	107.24%
q17	130.37	131.74	1.375	101.05%
q18	197.07	198.71	1.639	100.83%
q19	27.52	27.35	-0.173	99.37%
q20	41.72	41.43	-0.296	99.29%
q21	377.96	379.32	1.358	100.36%
q22	15.56	15.56	0.000	100.00%
total	1745.30	1751.51	6.212	100.36%