statistics: support global singleflight for sync load (#52796) (#53839)

[winoros]

cherry-pick #53839

What problem does this PR solve?

Issue Number: close #xxx

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

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[codecov]

Codecov Report

Attention: Patch coverage is 76.47059% with 8 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-7.1-20240828-v7.1.5@0002c1a). Learn more about missing BASE report.

Additional details and impacted files

@@                       Coverage Diff                        @@
##             release-7.1-20240828-v7.1.5     #55731   +/-   ##
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  Coverage                               ?   73.4302%           
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  Files                                  ?       1211           
  Lines                                  ?     380112           
  Branches                               ?          0           
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  Hits                                   ?     279117           
  Misses                                 ?      83163           
  Partials                               ?      17832           

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AilinKid, Rustin170506, time-and-fate

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-28 12:38:35.001228029 +0000 UTC m=+960310.135678148: ☑️ agreed by AilinKid.
• 2024-08-28 13:15:12.804948724 +0000 UTC m=+962507.939398844: ☑️ agreed by time-and-fate.