Use merge strategy to avoid work.karmada.io/permanent-id changes

[whitewindmills]

What type of PR is this?
/kind bug

What this PR does / why we need it:
Since labels will be overwritten every time they are updated and created, this causes work.karmada.io/permanent-id to constantly change.
I add some debug logs in karmada-webhook to capture the bug:

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

karmada-controller-manager: Fix the problem that work.karmada.io/permanent-id constantly changes with every update.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 51.76%. Comparing base (a0c0a98) to head (9c08138).

Files	Patch %	Lines
pkg/util/helper/work.go	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4793      +/-   ##
==========================================
+ Coverage   51.75%   51.76%   +0.01%     
==========================================
  Files         250      250              
  Lines       24980    24980              
==========================================
+ Hits        12928    12931       +3     
+ Misses      11342    11339       -3     
  Partials      710      710              

Flag	Coverage Δ
unittests	51.76% <0.00%> (+0.01%)	⬆️

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[whitewindmills]

/cc @XiShanYongYe-Chang @chaunceyjiang

[XiShanYongYe-Chang]

Nice finding! Did you discover the problem during development?

/lgtm
/kind bug

[whitewindmills]

Did you discover the problem during development?

Yes, this causes CI to always fail.

[whitewindmills]

Another PR #4743 still needs this, could you take look?
/cc @RainbowMango

[XiShanYongYe-Chang]

Hi @whitewindmills, how about adding the release note, I think we should cherry-pick this patch to the previous branch, how do you think?

[RainbowMango]

/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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