Automated cherry pick of #4784: labels cannot be deleted via Karmada propagation

[whitewindmills]

Cherry pick of #4784 on release-1.9.

4784: labels cannot be deleted via Karmada propagation

For details on the cherry pick process, see the cherry pick requests page.

karmada-controller-manager: Fix the problem that labels cannot be deleted via Karmada propagation.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 51.44%. Comparing base (4e34fdc) to head (ac060ab).

Files	Patch %	Lines
pkg/util/helper/work.go	0.00%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## release-1.9 #4797 +/- ## =============================================== - Coverage 51.46% 51.44% -0.03% =============================================== Files 250 250 Lines 24952 24952 =============================================== - Hits 12842 12837 -5 - Misses 11404 11408 +4 - Partials 706 707 +1 ``` | [Flag](https://app.codecov.io/gh/karmada-io/karmada/pull/4797/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/karmada-io/karmada/pull/4797/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io) | `51.44% <80.00%> (-0.03%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io#carryforward-flags-in-the-pull-request-comment) to find out more.

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[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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Needs approval from an approver in each of these files: - ~~[pkg/util/OWNERS](https://github.com/karmada-io/karmada/blob/release-1.9/pkg/util/OWNERS)~~ [RainbowMango] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment