refactor App Protect DoS controller

[pdabelf5]

Proposed changes

This change moves the App Protect DoS controller code to it's own file to help reduce the complexity of controller.go.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 201 lines in your changes missing coverage. Please review.

Project coverage is 45.86%. Comparing base (b32eae8) to head (ed54c03).
Report is 5 commits behind head on main.

Files	Patch %	Lines
internal/k8s/appprotect_dos.go	0.00%	201 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6212   +/-   ##
=======================================
  Coverage   45.86%   45.86%           
=======================================
  Files         142      143    +1     
  Lines       18961    18960    -1     
=======================================
  Hits         8696     8696           
+ Misses       9818     9817    -1     
  Partials      447      447           

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[jjngx]

👍🏻