feat(misconf): convert AWS managed policy to document

[nikpivkin]

Description

This PR adds support for converting AWS managed policies by their ARN or name into full IAM documents. For now, the conversion is only implemented for AmazonS3FullAccess policies as part of the AVD-AWS-0345 enhancement. No changes are required on the check side as it already works with IAM documents. An alternative solution is to export ARN policies to Rego and convert them in checks.

Related issues

• Close feat(checks): Improve AVD-AWS-0345 #8752

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).

[itaysk]

can you please update the documentation accordingly?

[nikpivkin]

can you please update the documentation accordingly?

Is this necessary? This change does not affect users.