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 :warning:

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Additional details and impacted files

```diff @@ 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](https://app.codecov.io/gh/karmada-io/karmada/pull/4793/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/4793/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io) | `51.76% <0.00%> (+0.01%)` | :arrow_up: | 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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[whitewindmills]

/cc @XiShanYongYe-Chang @chaunceyjiang

[whitewindmills]

Did you discover the problem during development?

Yes, this causes CI to always fail.

[whitewindmills]

Another PR https://github.com/karmada-io/karmada/pull/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?

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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