Added tests for pkg/descheduler/descheduler.go

[anujagrawal699]

Description:
This pull request enhances the Descheduler component with comprehensive unit tests and improved error handling. The new tests aim to improve code reliability, maintainability, and overall test coverage for descheduling operations.

Added error handling tests in the worker function, including:

1. Handling invalid key types
2. Dealing with invalid resource key formats
3. Proper handling of ResourceBindings that are not found or being deleted

Modifications:

1. pkg/descheduler/descheduler.go

Test Coverage:

1. pkg/descheduler/descheduler.go : 59.14% to 80.80%

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 35.31%. Comparing base (f656d9a) to head (c493e04).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5653      +/-   ##
==========================================
+ Coverage   35.23%   35.31%   +0.07%     
==========================================
  Files         645      645              
  Lines       44891    44891              
==========================================
+ Hits        15817    15852      +35     
+ Misses      27841    27809      -32     
+ Partials     1233     1230       -3     

Flag	Coverage Δ
unittests	35.31% <ø> (+0.07%)	⬆️

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[XiShanYongYe-Chang]

/assign

[XiShanYongYe-Chang]

Thannks~
/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• pkg/descheduler/OWNERS [XiShanYongYe-Chang]

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