pkg: unit test aggregatedAPIServer

[mohamedawnallah]

Description

In this commit, we unit test aggregatedAPIServer on creating new aggregatedAPIServer with clusterAPI.

What type of PR is this?

Which issue(s) this PR fixes:
Part of #5491.

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

Attention: Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 42.33%. Comparing base (5cd3c1a) to head (ccccace).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/aggregatedapiserver/apiserver.go	33.33%	4 Missing ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5778      +/-   ##
==========================================
+ Coverage   42.30%   42.33%   +0.03%     
==========================================
  Files         655      655              
  Lines       55756    55783      +27     
==========================================
+ Hits        23589    23618      +29     
+ Misses      30653    30652       -1     
+ Partials     1514     1513       -1     

Flag	Coverage Δ
unittests	42.33% <33.33%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[XiShanYongYe-Chang]

Thanks~
/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• pkg/aggregatedapiserver/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