variable: disable tidb_enable_historical_stats by default

[hawkingrei]

What problem does this PR solve?

Issue Number: close #53048

Problem Summary:

What changed and how does it work?

Check List

Tests

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

All modified and coverable lines are covered by tests ✅

Project coverage is 74.4494%. Comparing base (06ee59b) to head (b3317f2).
Report is 13 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #53046        +/-   ##
================================================
+ Coverage   72.0208%   74.4494%   +2.4286%     
================================================
  Files          1499       1508         +9     
  Lines        431246     438719      +7473     
================================================
+ Hits         310587     326624     +16037     
+ Misses       101361      91959      -9402     
- Partials      19298      20136       +838     

Flag	Coverage Δ
integration	49.1384% <ø> (?)
unit	71.3063% <ø> (+0.0747%)	⬆️

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

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	47.3160% <ø> (+8.9514%)	⬆️

[easonn7]

/approve

[hawkingrei]

/retest

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-05-07 03:25:18.095935034 +0000 UTC m=+932471.853070599: ☑️ agreed by AilinKid.
• 2024-05-07 05:38:10.118717689 +0000 UTC m=+940443.875853247: ☑️ agreed by hi-rustin.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AilinKid, easonn7, hi-rustin

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files:

• OWNERS [AilinKid,hi-rustin]
• pkg/sessionctx/variable/OWNERS [easonn7]
• pkg/statistics/OWNERS [AilinKid,hi-rustin]

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[hawkingrei]

/retest