Add 100% test coverage for matcher, shadow, and names.go in pkg/util

[NishantBansal2003]

What type of PR is this?
/kind feature
/kind failing-test

What this PR does / why we need it:
The test case coverage for interpreter/matcher.go, overridemanager/shadow.go and names/names.go has been increased to 100%.

Which issue(s) this PR fixes:
Ref #5235

Special notes for your reviewer:
To verify the changes in the pkg/util directory run the following commands:

go test ./... -coverprofile=coverage.out
go tool cover -html=coverage.out -o coverage.html
open coverage.html

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.54%. Comparing base (37488bd) to head (95b421d).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5339      +/-   ##
==========================================
+ Coverage   28.53%   28.54%   +0.01%     
==========================================
  Files         632      632              
  Lines       43856    43856              
==========================================
+ Hits        12515    12520       +5     
+ Misses      30443    30439       -4     
+ Partials      898      897       -1     

Flag	Coverage Δ
unittests	28.54% <ø> (+0.01%)	⬆️

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[NishantBansal2003]

Hey @XiShanYongYe-Chang, PTAL, and provide your valuable feedback.

[NishantBansal2003]

Hi @XiShanYongYe-Chang, just pinging in case this PR was missed.

[XiShanYongYe-Chang]

Thanks @NishantBansal2003
/assign

[XiShanYongYe-Chang]

Thanks~
/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• pkg/util/OWNERS [XiShanYongYe-Chang]

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