Added unit tests for reflect status interpreter

[anujagrawal699]

Description:
This PR standardizes and enhances tests for pkg/resourceinterpreter/default/native/reflectstatus.go, focusing on consistent test patterns and better coverage. It add tests for untested functions, refactors all status reflection tests to use a unified structure, adds missing edge cases and improves assertion handling with the assert package. These changes improve test maintainability, readability, and overall coverage while ensuring consistent validation across different resource types.

Modifications:

1. addedTests-pkg/resourceinterpreter/default/native/reflectstatus_test.go

Test Coverage:

1. addedTests-pkg/resourceinterpreter/default/native/reflectstatus.go : 22.66 to 90.60%

What type of PR is this?
/kind feature

Which issue(s) this PR fixes:
Fixes a part of #5470

Does this PR introduce a user-facing change?:

NONE

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.85%. Comparing base (3acc14c) to head (59f266c).
Report is 12 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5828      +/-   ##
==========================================
+ Coverage   45.56%   45.85%   +0.29%     
==========================================
  Files         658      658              
  Lines       53921    53926       +5     
==========================================
+ Hits        24567    24730     +163     
+ Misses      27750    27583     -167     
- Partials     1604     1613       +9     

Flag	Coverage Δ
unittests	45.85% <ø> (+0.29%)	⬆️

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[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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