Add missing read only access policy

[xsaero00]

The role is used for polling integration as well as for metric streams. Polling integration require read access to AWS account.

Description

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Fixes # (issue)

Type of change

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• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Checklist:

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• [ ] My commit message follows conventional commits
• [ ] My code is formatted to Go standards
• [ ] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes. Go here for instructions on running tests locally.

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