pkg/search: unit test karmada search APIServer

[mohamedawnallah]

Description

In this commit, we unit test karmada search APIServer on creating REST storage and installing the API group.

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

Does this PR introduce a user-facing change?:

NONE

[karmada-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov-commenter]

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Codecov Report

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

Project coverage is 42.88%. Comparing base (a935aa1) to head (c059c68).
Report is 10 commits behind head on master.

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

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5795      +/-   ##
==========================================
+ Coverage   42.33%   42.88%   +0.55%     
==========================================
  Files         656      656              
  Lines       55871    55888      +17     
==========================================
+ Hits        23653    23968     +315     
+ Misses      30699    30369     -330     
- Partials     1519     1551      +32     

Flag	Coverage Δ
unittests	42.88% <33.33%> (+0.55%)	⬆️

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