chore(iam): add exception for public policy in EKS service

[puchy22]

Context

Fix #4745

Description

Update function is_policy_public adding exception for EKS service.

Checklist

• Are there new checks included in this PR? No
  • If so, do we need to update permissions for the provider? No
• Review if the code is being covered by tests.
• Review if code is being documented following this specification https://github.com/google/styleguide/blob/gh-pages/pyguide.md#38-comments-and-docstrings

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.90%. Comparing base (78b518e) to head (597952d).
Report is 17 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4759      +/-   ##
==========================================
+ Coverage   89.88%   89.90%   +0.01%     
==========================================
  Files        1132     1132              
  Lines       35275    35275              
==========================================
+ Hits        31707    31714       +7     
+ Misses       3568     3561       -7     

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[MrCloudSec]

I think we should improve the logic of the check to avoid false negatives, like in #4714 too.