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 :white_check_mark:

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

Additional details and impacted files

```diff @@ 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](https://app.codecov.io/gh/pingcap/tidb-operator/pull/5606/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | Coverage Δ | | |---|---|---| | [e2e](https://app.codecov.io/gh/pingcap/tidb-operator/pull/5606/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `34.12% <ø> (?)` | | | [unittest](https://app.codecov.io/gh/pingcap/tidb-operator/pull/5606/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `61.53% <ø> (-0.01%)` | :arrow_down: |

[BornChanger]

/run-pull-e2e-kind

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

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

[BornChanger]

/merge

[ti-chi-bot[bot]]

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[BornChanger]

/approve

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BornChanger

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