refactor ensure work

[XiShanYongYe-Chang]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

The ensureWork function has some load, and its complexity will continue to increase during ongoing iterations. Therefore, some refactoring has been done on this function.

Which issue(s) this PR fixes: Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[karmada-bot]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 34.34343% with 65 lines in your changes missing coverage. Please review.

Project coverage is 35.86%. Comparing base (5692e28) to head (8413ed6). Report is 415 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/controllers/binding/common.go	35.95%	55 Missing and 2 partials :warning:
pkg/controllers/binding/binding_controller.go	20.00%	4 Missing :warning:
...ers/binding/cluster_resource_binding_controller.go	20.00%	4 Missing :warning:

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5660      +/-   ##
==========================================
- Coverage   35.91%   35.86%   -0.05%     
==========================================
  Files         648      648              
  Lines       45079    45095      +16     
==========================================
- Hits        16189    16174      -15     
- Misses      27645    27675      +30     
- Partials     1245     1246       +1     

Flag	Coverage Δ
unittests	35.86% <34.34%> (-0.05%)	:arrow_down:

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[XiShanYongYe-Chang]

/cc @RainbowMango

[RainbowMango]

OK. will do.

[XiShanYongYe-Chang]

/close

[karmada-bot]

@XiShanYongYe-Chang: Closed this PR.

In response to this:

/close

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