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-7.5@55eefb6). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.5     #56257   +/-   ##
================================================
  Coverage               ?   72.0229%           
================================================
  Files                  ?       1413           
  Lines                  ?     411988           
  Branches               ?          0           
================================================
  Hits                   ?     296726           
  Misses                 ?      95374           
  Partials               ?      19888           

Flag	Coverage Δ
unit	72.0229% <40.0000%> (?)

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

Components	Coverage Δ
dumpling	52.9400% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	53.5192% <0.0000%> (?)

[Benjamin2037]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Benjamin2037, lance6716

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-24 09:05:59.345877756 +0000 UTC m=+1556829.086301694: ☑️ agreed by lance6716.
• 2024-09-24 09:35:35.120880765 +0000 UTC m=+1558604.861304704: ☑️ agreed by Benjamin2037.