Added tests for controllers/deploymentreplicassyncer

[anujagrawal699]

Description:
This PR introduces tests for deploymentreplicassyncer controller. The new addition tests significant logic of deploymentreplicassyncer controller.

Additions:

1. TestPredicateFunc:

   • Added tests for various scenarios including label changes, replica changes, and different event types (Create, Update, Delete, Generic).
   • Ensures the predicate function correctly filters relevant events.

2. TestSetupWithManager:

   • Verifies that the controller can be properly set up with a manager.

3. TestReconcile:

   • Added test cases for different reconciliation scenarios:
     • Binding not found
     • Non-divided scheduling type
     • Replicas already synced
   • Checks for correct result, error handling, and replica updates.

4. TestIsDeploymentStatusCollected:

   • Covers various scenarios:
     • Fully collected status
     • Mismatched replicas
     • Generation mismatches
     • Incomplete aggregated status
     • Invalid JSON in status
     • Zero replicas in status
     • Mismatched status replicas

Test Coverage:
The test coverage of the deploymentreplicassyncer controller has been increased to 63.9% .

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

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[anujagrawal699]

The TestSetupWithManager is removed in the latest commit because it was causing CI failures and provided limited value in terms of testing the controller's core functionality.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 31.81%. Comparing base (32c2ef7) to head (9f02242).
Report is 64 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5493      +/-   ##
==========================================
+ Coverage   31.70%   31.81%   +0.11%     
==========================================
  Files         643      643              
  Lines       44445    44445              
==========================================
+ Hits        14090    14142      +52     
+ Misses      29325    29270      -55     
- Partials     1030     1033       +3     

Flag	Coverage Δ
unittests	31.81% <ø> (+0.11%)	⬆️

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[anujagrawal699]

@XiShanYongYe-Chang Please take a look.