chore(iam): Add note for EKS not repairable case

[puchy22]

Context

Fix #4745

Description

Update iam_role_cross_service_confused_deputy_prevention metadata.

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 89.13%. Comparing base (bcc8d5f) to head (d591ee1).
Report is 39 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4759      +/-   ##
==========================================
+ Coverage   89.10%   89.13%   +0.03%     
==========================================
  Files         913      920       +7     
  Lines       27913    28125     +212     
==========================================
+ Hits        24871    25070     +199     
- Misses       3042     3055      +13     

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[sergargar]

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