remove old MergeAnnotation func and rename ReplaceAnnotation to MergeAnnotation

[XiShanYongYe-Chang]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Learn from #4751, to avoid ambiguity and to be consistent with the Annotation naming convention:

https://github.com/karmada-io/karmada/blob/57c1989667d826864aa09105daa04434e2c75dd9/pkg/util/annotation.go#L29-L51

remove old MergeAnnotation func and rename ReplaceAnnotation to MergeAnnotation.

Which issue(s) this PR fixes: Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 51.77%. Comparing base (4e25482) to head (e511ad7).

Files	Patch %	Lines
pkg/util/helper/work.go	0.00%	2 Missing :warning:
pkg/detector/detector.go	0.00%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4776 +/- ## ========================================== - Coverage 51.78% 51.77% -0.02% ========================================== Files 250 250 Lines 24989 24980 -9 ========================================== - Hits 12941 12933 -8 + Misses 11339 11338 -1 Partials 709 709 ``` | [Flag](https://app.codecov.io/gh/karmada-io/karmada/pull/4776/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/4776/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io) | `51.77% <0.00%> (-0.02%)` | :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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[XiShanYongYe-Chang]

Can you help take a look again @whitewindmills @RainbowMango ?

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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