cli: avoid glog flags inject into tidb cli

[hawkingrei]

What problem does this PR solve?

Issue Number: close #47204

Problem Summary:

What is changed and how it works?

In the initial version, the initialization process would include glog. Now, with this update, we have made a few changes. After the main function starts, the initflag function will be cleared first, and then the program will continue to execute.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

tidb-server --help

  -log-file string
        log file path
  -log-slow-query string
        slow query file path

• No need to test

  • I checked and no code files have been changed.

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

[codecov]

Codecov Report

Merging #47205 (2297944) into master (db4ebd7) will increase coverage by 0.1970%.
Report is 34 commits behind head on master.
The diff coverage is 98.4848%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #47205        +/-   ##
================================================
+ Coverage   72.9511%   73.1482%   +0.1970%     
================================================
  Files          1340       1369        +29     
  Lines        399976     412360     +12384     
================================================
+ Hits         291787     301634      +9847     
- Misses        89282      91885      +2603     
+ Partials      18907      18841        -66     

Flag	Coverage Δ
integration	34.1236% <98.4848%> (?)
unit	73.3667% <0.0000%> (+0.4156%)	⬆️

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

Components	Coverage Δ
dumpling	53.9913% <ø> (ø)
parser	84.9340% <ø> (-0.0026%)	⬇️
br	48.8227% <ø> (-4.1973%)	⬇️

[hawkingrei]

/test all

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-09-25 01:49:12.82978617 +0000 UTC m=+239542.548128386: ☑️ agreed by tiancaiamao.
• 2023-09-25 03:55:06.90515262 +0000 UTC m=+247096.623494836: ☑️ agreed by xhebox.

[easonn7]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: easonn7, tiancaiamao, xhebox

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Needs approval from an approver in each of these files:

• OWNERS [tiancaiamao,xhebox]
• config/OWNERS [easonn7]

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[hawkingrei]

/retest

[hawkingrei]

/retest