Added tests for multiclusterservice controller

[anujagrawal699]

Description:
This PR introduces comprehensive unit tests for the Multi-Cluster Services controllers. These tests aim to improve code reliability and facilitate easier maintenance and future development.

Additions:

1. pkg/controllers/multiclusterservice/endpointslice_collect_controller_test.go
2. pkg/controllers/multiclusterservice/endpointslice_dispatch_controller_test.go
3. pkg/controllers/multiclusterservice/mcs_controller_test.go

Test Coverage:

1. endpointslice_collect_controller_test.go : 0% to 24.5%
2. endpointslice_dispatch_controller_test.go : 0% to 44.6%
3. mcs_controller_test.go : 0% to 38.2%

Overall coverage of multiclusterservice controller : 0% to 35.8%

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

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

Does this PR introduce a user-facing change?:

NONE

[anujagrawal699]

Hi @mohamedawnallah, #5287 is failing. Can you please check.

[mohamedawnallah]

Thanks, @anujagrawal699, for the heads-up! @XiShanYongYe-Chang proactively submitted a PR for this (#5580) and it's currently under review.

[anujagrawal699]

Thanks, @anujagrawal699, for the heads-up! @XiShanYongYe-Chang proactively submitted a PR for this (#5580) and it's currently under review.

Ohkay, Thanks!

[XiShanYongYe-Chang]

/retest

[XiShanYongYe-Chang]

/assign

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 34.83%. Comparing base (673a603) to head (b7b508b).
Report is 26 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5589      +/-   ##
==========================================
+ Coverage   34.10%   34.83%   +0.72%     
==========================================
  Files         645      645              
  Lines       44857    44857              
==========================================
+ Hits        15298    15624     +326     
+ Misses      28400    28028     -372     
- Partials     1159     1205      +46     

Flag	Coverage Δ
unittests	34.83% <ø> (+0.72%)	⬆️

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[XiShanYongYe-Chang]

/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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