feat(iam): improve rules handling

[Codelax]

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 82.06897% with 26 lines in your changes missing coverage. Please review.

Project coverage is 77.22%. Comparing base (5bf53e0) to head (42401f7).
Report is 272 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/namespaces/iam/v1alpha1/custom_policy.go	57.89%	13 Missing and 3 partials ⚠️
internal/namespaces/iam/v1alpha1/custom_rule.go	90.19%	5 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3753      +/-   ##
==========================================
+ Coverage   75.45%   77.22%   +1.76%     
==========================================
  Files         202      204       +2     
  Lines       44323    37272    -7051     
==========================================
- Hits        33444    28783    -4661     
+ Misses       9653     7255    -2398     
- Partials     1226     1234       +8     

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