fix(misconf): wrap AWS EnvVar to iac types

[nikpivkin]

Description

EnvVar fields had primitive Go types that were not exported to Rego.

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).
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