log: revert mistakenly change library logger level to debug

[lance6716]

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary:

What is changed and how it works?

I forget to revert tidbLogCfg.Level = "debug" in #46726

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[tiprow]

Hi @lance6716. Thanks for your PR.

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[hawkingrei]

When do we complete this TODO?

[lance6716]

I'm not sure, I don't know the details about this problem

[codecov]

Codecov Report

Merging #46846 (ea118cf) into master (e76d10a) will increase coverage by 0.4477%.
Report is 47 commits behind head on master.
The diff coverage is 100.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #46846        +/-   ##
================================================
+ Coverage   73.3166%   73.7643%   +0.4477%     
================================================
  Files          1322       1352        +30     
  Lines        396479     413182     +16703     
================================================
+ Hits         290685     304781     +14096     
- Misses        87265      89949      +2684     
+ Partials      18529      18452        -77     

Flag	Coverage Δ
integration	28.7841% <0.0000%> (?)
unit	74.3802% <100.0000%> (+1.0636%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	54.0444% <ø> (ø)
parser	85.4209% <ø> (+0.4600%)	⬆️
br	49.1743% <100.0000%> (-3.4634%)	⬇️

[lance6716]

/cc @GMHDBJD @D3Hunter

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: D3Hunter, hawkingrei

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-09-11 05:22:58.66764947 +0000 UTC m=+246760.592205866: ☑️ agreed by hawkingrei.
• 2023-09-13 08:04:29.829053995 +0000 UTC m=+72635.796642044: ☑️ agreed by D3Hunter.