operator/pkg/controlplane: unit test apiserver

[mohamedawnallah]

Description

In this commit, we introduce unit tests for both control plane apiserver and aggregated apiserver for the operator.

What type of PR is this?

Which issue(s) this PR fixes:
Part of #5491

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 39.02%. Comparing base (19b32a2) to head (255b0b8).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5576   +/-   ##
=======================================
  Coverage   39.02%   39.02%           
=======================================
  Files         650      650           
  Lines       45207    45207           
=======================================
+ Hits        17641    17643    +2     
  Misses      26207    26207           
+ Partials     1359     1357    -2     

Flag	Coverage Δ
unittests	39.02% <ø> (+<0.01%)	⬆️

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[mohamedawnallah]

cc @XiShanYongYe-Chang All tests cases passed now after rebasing :)

[XiShanYongYe-Chang]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

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

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