*: fix empty SQL in slow log for internal statement

[lcwangchao]

What problem does this PR solve?

Issue Number: close #54190 , close #52743 , close #53264

What changed and how does it work?

The internal session does not init EnableRedactLog which cause redact.String always returns empty string.

Init it as an default value in this PR.

Check List

Tests

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

set @@tidb_slow_log_threshold=0;

And check the output slow logs. No empty strings again.

• 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.

fix empty SQL in slow log for internal statement

[tiprow]

Hi @lcwangchao. Thanks for your PR.

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[lcwangchao]

/check-issue-triage-complete

[lcwangchao]

/check-issue-triage-complete

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-06-27 07:50:21.813912835 +0000 UTC m=+878748.299401662: ☑️ agreed by ywqzzy.
• 2024-06-27 07:53:02.443388722 +0000 UTC m=+878908.928877555: ☑️ agreed by xhebox.

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 56.3466%. Comparing base (521c999) to head (23ffd64).
Report is 14 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #54274         +/-   ##
=================================================
- Coverage   74.7837%   56.3466%   -18.4372%     
=================================================
  Files          1523       1644        +121     
  Lines        361533     614159     +252626     
=================================================
+ Hits         270368     346058      +75690     
- Misses        71520     244775     +173255     
- Partials      19645      23326       +3681     

Flag	Coverage Δ
integration	38.2081% <20.0000%> (?)
unit	71.8007% <60.0000%> (-1.8793%)	⬇️

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

Components	Coverage Δ
dumpling	52.9656% <ø> (-2.2339%)	⬇️
parser	∅ <ø> (∅)
br	52.7422% <ø> (+4.7948%)	⬆️

[easonn7]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• OWNERS [xhebox,ywqzzy]
• pkg/sessionctx/variable/OWNERS [easonn7]

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #54309.