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 ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@               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	Coverage Δ
unittests	51.44% <80.00%> (-0.03%)	⬇️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[XiShanYongYe-Chang]

Thanks~
/lgtm

[RainbowMango]

/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• 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