fix:[CORE-1379] handle noentityfound exception for iam policies

[raviteja-mandala]

Description

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any dependencies that are required for this change.

Fixes # (issue)

1. When NoSuchEntityFoundException is thrown from class IAMRoleWithUnapprovedAccessRule.java(which affects 3 policies), exception is caught and validation is assigned 'unknown' status. Data alert is not published.

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Chore (no code changes)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

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Checklist:

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• 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

Other information:

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[sonarcloud]

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