chore: Use != for RV comparison

[whitewindmills]

What type of PR is this? /kind cleanup

What this PR does / why we need it: There is no need to use reflect.DeepEqual for string comparison, so to improve it!

Which issue(s) this PR fixes: Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: XiShanYongYe-Chang

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Needs approval from an approver in each of these files: - ~~[pkg/controllers/OWNERS](https://github.com/karmada-io/karmada/blob/master/pkg/controllers/OWNERS)~~ [XiShanYongYe-Chang] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 53.12%. Comparing base (3ff8700) to head (9c70349). Report is 4 commits behind head on master.

Files	Patch %	Lines
pkg/controllers/status/common.go	0.00%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4911 +/- ## ========================================== - Coverage 53.12% 53.12% -0.01% ========================================== Files 251 251 Lines 20415 20415 ========================================== - Hits 10846 10845 -1 - Misses 8855 8856 +1 Partials 714 714 ``` | [Flag](https://app.codecov.io/gh/karmada-io/karmada/pull/4911/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/4911/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io) | `53.12% <0.00%> (-0.01%)` | :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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