Add GitHub Actions workflow for checking/deleting inactive IAM collaborators

[sukeshreddyg]

…orators

A reference to the issue / Description of it

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How does this PR fix the problem?

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How has this been tested?

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Deployment Plan / Instructions

Will this deployment impact the platform and / or services on it?

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Checklist (check x in [ ] of list items)

• [ ] I have performed a self-review of my own code
• [ ] All checks have passed
• [ ] I have made corresponding changes to the documentation
• [ ] Plan and discussed how it should be deployed to PROD (If needed)

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