lightning: fix SET SESSION on connection pool (#54927)

[ti-chi-bot]

This is an automated cherry-pick of #54927

What problem does this PR solve?

Issue Number: close #49826

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

Attention: Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-6.5@2253874). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-6.5     #55771   +/-   ##
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  Coverage               ?   73.6586%           
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  Files                  ?       1097           
  Lines                  ?     352468           
  Branches               ?          0           
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  Hits                   ?     259623           
  Misses                 ?      76161           
  Partials               ?      16684           

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fzzf678, lance6716

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-30 07:45:14.352118965 +0000 UTC m=+1115509.486569087: ☑️ agreed by lance6716.
• 2024-08-30 07:48:15.734360167 +0000 UTC m=+1115690.868810288: ☑️ agreed by fzzf678.