add e2e test for deployment replicas syncer

[chaosi-zju]

What type of PR is this?

/kind failing-test

What this PR does / why we need it:

Resubmit the PR #4716.

Due to the bug of #4758, this e2e PR was reverted to avoid the long-term failure of e2e.

Now, the bug has been fixed, resubmit this e2e PR again.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[chaosi-zju]

ping @XiShanYongYe-Chang

[XiShanYongYe-Chang]

/assign

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 51.77%. Comparing base (ff7322a) to head (8b9e1e2).

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4764 +/- ## ========================================== - Coverage 51.79% 51.77% -0.03% ========================================== Files 250 250 Lines 24991 24991 ========================================== - Hits 12945 12940 -5 - Misses 11337 11341 +4 - Partials 709 710 +1 ``` | [Flag](https://app.codecov.io/gh/karmada-io/karmada/pull/4764/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/4764/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io) | `51.77% <ø> (-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: XiShanYongYe-Chang

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