fix: remove extra slash when constructing member cluster URL to adapt…

[spiritNO1]

… the apiEndpoint of the cluster object ends with a slash.

What type of PR is this?

What this PR does / why we need it:

Which issue(s) this PR fixes:
Fixes #5455

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

karmada-aggregated-apiserver: User can append a "/" at the end when configuring the cluster's apiEndpoint.

[spiritNO1]

/approve

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 53.34%. Comparing base (5c6c155) to head (ad357bc).

Files with missing lines	Patch %	Lines
pkg/registry/cluster/storage/aggregate.go	66.66%	1 Missing ⚠️

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Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.10    #5556      +/-   ##
================================================
+ Coverage         53.29%   53.34%   +0.04%     
================================================
  Files               253      253              
  Lines             20597    20597              
================================================
+ Hits              10978    10988      +10     
+ Misses             8890     8878      -12     
- Partials            729      731       +2     

Flag	Coverage Δ
unittests	53.34% <66.66%> (+0.04%)	⬆️

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[XiShanYongYe-Chang]

@spiritNO1 thanks, can you help fix the lint?

[XiShanYongYe-Chang]

Kindly ping @spiritNO1

[spiritNO1]

Kindly ping @spiritNO1

OK, I will fix it in a few days

[XiShanYongYe-Chang]

/lgtm
/approve
Thanks~

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: spiritNO1, XiShanYongYe-Chang

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