Automated cherry pick of #6065: fix: resourceregistry merge the same cluster gvk's namespace

[JimDevil]

Cherry pick of #6065 on release-1.10.
#6065: fix: resourceregistry merge the same cluster gvk's namespace
For details on the cherry pick process, see the cherry pick requests page.

`karmada-search`: Fixed the issue that namespaces in different ResourceRegistry might be overwritten.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 68.96552% with 9 lines in your changes missing coverage. Please review.

Project coverage is 50.91%. Comparing base (908c04b) to head (64192b4).

Files with missing lines	Patch %	Lines
pkg/search/proxy/controller.go	66.66%	4 Missing and 2 partials ⚠️
pkg/search/proxy/store/util.go	72.72%	2 Missing and 1 partial ⚠️

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Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.10    #6102      +/-   ##
================================================
+ Coverage         50.90%   50.91%   +0.01%     
================================================
  Files               265      265              
  Lines             26745    26762      +17     
================================================
+ Hits              13614    13627      +13     
- Misses            12353    12356       +3     
- Partials            778      779       +1     

Flag	Coverage Δ
unittests	50.91% <68.96%> (+0.01%)	⬆️

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[RainbowMango]

/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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