Add sleep before shutdown backup container (#5454)

[ti-chi-bot]

This is an automated cherry-pick of #5454

What problem does this PR solve?

Add sleep before shutdown backup container

What is changed and how does it work?

Code changes

• Has Go code change
• Has CI related scripts change

Tests

• Unit test
• E2E test
• Manual test
• No code

Side effects

• Breaking backward compatibility
• Other side effects:

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

[BornChanger]

/retest

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.52%. Comparing base (724031b) to head (1270aa3).

Additional details and impacted files

@@               Coverage Diff               @@
##           release-1.5    #5606      +/-   ##
===============================================
+ Coverage        61.54%   64.52%   +2.97%     
===============================================
  Files              229      242      +13     
  Lines            29331    33297    +3966     
===============================================
+ Hits             18052    21484    +3432     
- Misses            9498     9950     +452     
- Partials          1781     1863      +82     

Flag	Coverage Δ
e2e	34.12% <ø> (?)
unittest	61.53% <ø> (-0.01%)	⬇️

[BornChanger]

/run-pull-e2e-kind

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-04-03 17:05:12.103966629 +0000 UTC m=+463573.631507168: ☑️ agreed by BornChanger.

[BornChanger]

/merge

[ti-chi-bot]

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[BornChanger]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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