Revert "server: Set default drainClientWait as 15s (#42134) (#48944)"

[djshow832]

This reverts commit 877198d.

What problem does this PR solve?

Issue Number: ref #49098

Problem Summary:
#32111 causes too many problems, so we decided to revert it in v6.5.6 and merge #49073 to v6.5.6.

What changed and how does it work?

Revert PR.

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

[tiprow]

Hi @djshow832. Thanks for your PR.

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.5@e5ee37e). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-6.5     #49101   +/-   ##
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  Coverage               ?   73.6315%           
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  Files                  ?       1087           
  Lines                  ?     349436           
  Branches               ?          0           
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  Hits                   ?     257295           
  Misses                 ?      75621           
  Partials               ?      16520           

[bb7133]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bb7133, tiancaiamao

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-12-01 10:51:49.207604085 +0000 UTC m=+1179137.872830279: ☑️ agreed by tiancaiamao.
• 2023-12-04 04:05:22.116104399 +0000 UTC m=+1413950.781330594: ☑️ agreed by bb7133.