feat: Add iam_policy_path var

[hedinasr]

Description

Add iam_policy_path var to set specific path for the custom policy.

Motivation and Context

We want to set a policy path different from the role path.

Breaking Changes

N/A

How Has This Been Tested?

• I have updated at least one of the examples/* to demonstrate and validate my change(s)
• I have tested and validated these changes using one or more of the provided examples/* projects

• I have executed pre-commit run -a on my pull request

[bryantbiggs]

thank you but this is not a change we are looking to make at this time - if you wish to control more, you can simply provide your own policy

[hedinasr]

Thank you @bryantbigg, I would like to provide my own policy, can you show me some examples please?

[github-actions]

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