Introduce Exclusions on PolicyCRD instead of rego

[waleedhammam]

Closes #211

What changed?

• Introduce exclude field on the policy CRD to have one or more of [namespaces, resources, labels]
• Update the policies in the Repo

Why was this change made?

We have exclusions embedded in the policies Rego Code. While it works, it has its drawbacks with not being discovered, and interferring with policy parameters. So we want to make it more prominent.

How was this change implemented?

• Introducing the new exclusions field
• Check the entities against the policy exclude them to avoid validating this entity if it's excluded

How did you validate the change?

• Unit Test
• Manual Test

Release notes

Documentation Changes

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (1c286d2) 78.35% compared to head (b030625) 78.70%.

Files	Patch %	Lines
pkg/policy-core/validation/common.go	93.93%	1 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #217      +/-   ##
==========================================
+ Coverage   78.35%   78.70%   +0.35%     
==========================================
  Files          20       20              
  Lines        1289     1329      +40     
==========================================
+ Hits         1010     1046      +36     
- Misses        212      216       +4     
  Partials       67       67              

Flag	Coverage Δ
unit	78.70% <95.00%> (+0.35%)	⬆️

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[Samra10]

LGTM just minor changes for a simpler code block.

Tested & working as expected. ✅
I like the new flag. now it's easier to apply the exclusion and a simpler policy code. 👌