br: add more retry strategy (s3.ReadFile: body reader / pushBackup: backoffer)

[Leavrth]

What problem does this PR solve?

Issue Number: close #49942

Problem Summary:
backup/restore failed for external storage error

What changed and how does it work?

add more retry strategy (s3.ReadFile: body reader / pushBackup: backoffer)

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]

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[codecov]

Codecov Report

Merging #50541 (0101e48) into master (0568385) will decrease coverage by 14.6962%.
Report is 4 commits behind head on master.
The diff coverage is 68.2539%.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #50541         +/-   ##
=================================================
- Coverage   70.3389%   55.6427%   -14.6963%     
=================================================
  Files          1456       1567        +111     
  Lines        420707     589399     +168692     
=================================================
+ Hits         295921     327958      +32037     
- Misses       104456     238605     +134149     
- Partials      20330      22836       +2506     

Flag	Coverage Δ
integration	36.7135% <12.6984%> (?)

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

Components	Coverage Δ
dumpling	54.0269% <ø> (ø)
parser	∅ <ø> (∅)
br	56.5393% <68.2539%> (+6.0101%)	⬆️

[BornChanger]

/label needs-cherry-pick-release-6.5

[BornChanger]

/label needs-cherry-pick-release-7.1

[BornChanger]

/label needs-cherry-pick-release-7.5

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 3pointer, YuJuncen

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Needs approval from an approver in each of these files:

• br/OWNERS [3pointer,YuJuncen]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-24 08:49:38.926470131 +0000 UTC m=+950620.490767836: ☑️ agreed by YuJuncen.
• 2024-01-24 09:53:13.391700751 +0000 UTC m=+954434.955998456: ☑️ agreed by 3pointer.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #50706.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #50707.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #50708.