external: improve S3 error message (#59327)

[ti-chi-bot]

This is an automated cherry-pick of #59327

What problem does this PR solve?

Issue Number: close #59326

Problem Summary:

What changed and how does it work?

simply use %s instead of %v when printf

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 46.66667% with 8 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-7.5@9b364e6). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.5     #59749   +/-   ##
================================================
  Coverage               ?   72.3890%           
================================================
  Files                  ?       1417           
  Lines                  ?     414813           
  Branches               ?          0           
================================================
  Hits                   ?     300279           
  Misses                 ?      94540           
  Partials               ?      19994           

Flag	Coverage Δ
unit	72.3890% <46.6666%> (?)

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	53.7114% <0.0000%> (?)

[lance6716]

/retest

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-02-26 08:01:34.913642881 +0000 UTC m=+429242.866801147: ☑️ agreed by lance6716.
• 2025-02-26 13:52:18.25773511 +0000 UTC m=+450286.210893376: ☑️ agreed by D3Hunter.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: D3Hunter, lance6716, YuJuncen

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• br/OWNERS [YuJuncen]

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[hawkingrei]

/retest

[lance6716]

/retest