🌱 Add cluster decorator interface in register

[qiujian16]

And refactor creating to controller to call decorators

Summary

Related issue(s)

Fixes #

[openshift-ci]

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[codecov]

Codecov Report

Attention: Patch coverage is 78.26087% with 10 lines in your changes missing coverage. Please review.

Project coverage is 63.36%. Comparing base (a138a54) to head (f013745).
Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
...stration/spoke/registration/creating_controller.go	78.37%	6 Missing and 2 partials ⚠️
pkg/registration/register/csr/csr.go	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #752      +/-   ##
==========================================
+ Coverage   63.32%   63.36%   +0.04%     
==========================================
  Files         186      187       +1     
  Lines       17912    17932      +20     
==========================================
+ Hits        11343    11363      +20     
- Misses       5634     5635       +1     
+ Partials      935      934       -1     

Flag	Coverage Δ
unit	63.36% <78.26%> (+0.04%)	⬆️

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