Added tests for hpascaletargetmarker controller

[anujagrawal699]

Description: This PR introduces comprehensive unit tests for the HPA Scale Target Marker controller, predicate, and worker components. These tests aim to improve code reliability and facilitate easier maintenance and future development.

Additions:

1. pkg/controllers/hpascaletargetmarker/hpa_scale_target_marker_controller_test.go
2. pkg/controllers/hpascaletargetmarker/hpa_scale_target_marker_predicate_test.go
3. pkg/controllers/hpascaletargetmarker/hpa_scale_target_marker_worker_test.go

Test Coverage:

1. hpa_scale_target_marker_controller_test.go : 0% to 100%
2. hpa_scale_target_marker_predicate_test.go : 0% to 96.7%
3. hpa_scale_target_marker_worker_test.go : 0% to 70.3% Overall coverage of hpascaletargetmarker controller: 0% to 79.8%

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

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

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 34.13%. Comparing base (ba360c9) to head (50634c5). Report is 50 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5553      +/-   ##
==========================================
- Coverage   34.14%   34.13%   -0.01%     
==========================================
  Files         643      645       +2     
  Lines       44524    44857     +333     
==========================================
+ Hits        15203    15313     +110     
- Misses      28165    28379     +214     
- Partials     1156     1165       +9     

Flag	Coverage Δ
unittests	34.13% <ø> (-0.01%)	:arrow_down:

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[XiShanYongYe-Chang]

Thanks~ /assign

[karmada-bot]

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[anujagrawal699]

@chaosi-zju Please take a look.