Added tests for scheduler plugins

[anujagrawal699]

Description:
This PR enhances the test coverage for various scheduler plugins by adding comprehensive unit tests. These additions aim to increase code reliability, maintainability, and ensure proper functionality of the scheduler plugins.

Additions:

1. pkg/scheduler/framework/plugins/apienablement/api_enablement_test.go
2. pkg/scheduler/framework/plugins/clusteraffinity/cluster_affinity_test.go
3. pkg/scheduler/framework/plugins/clustereviction/cluster_eviction_test.go
4. pkg/scheduler/framework/plugins/clusterlocality/cluster_locality_test.go
5. pkg/scheduler/framework/plugins/spreadconstraint/spread_constraint_test.go
6. pkg/scheduler/framework/plugins/tainttoleration/taint_toleration_test.go

Test Coverage:

1. pkg/scheduler/framework/plugins/apienablement/api_enablement_test.go : 0% to 100%
2. pkg/scheduler/framework/plugins/clusteraffinity/cluster_affinity_test.go : 0% to 100%
3. pkg/scheduler/framework/plugins/clustereviction/cluster_eviction_test.go : 0% to 100%
4. pkg/scheduler/framework/plugins/clusterlocality/cluster_locality_test.go : 0% to 100%
5. pkg/scheduler/framework/plugins/spreadconstraint/spread_constraint_test.go : 0% to 100%
6. pkg/scheduler/framework/plugins/tainttoleration/taint_toleration_test.go : 0% to 100%
   pkg/scheduler/framework/plugins : 8.79% to 100%

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 35.38%. Comparing base (6b18b6e) to head (e818659).
Report is 2 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5642      +/-   ##
==========================================
+ Coverage   35.19%   35.38%   +0.18%     
==========================================
  Files         645      645              
  Lines       44869    44869              
==========================================
+ Hits        15792    15877      +85     
+ Misses      27846    27762      -84     
+ Partials     1231     1230       -1     

Flag	Coverage Δ
unittests	35.38% <ø> (+0.18%)	⬆️

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[XiShanYongYe-Chang]

Thanks a lot~
Good Job.
/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• pkg/scheduler/OWNERS [XiShanYongYe-Chang]

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