OCM-16226 | feat: add 'iam:GetUser' to hcp installer policy

[gdbranco]

What type of PR is this?

feature

What this PR does / why we need it?

This allows to include verification of the 'rosa_creator_arn' cluster property to ensure that the populated user is valid and exists in the customer account

Which Jira/Github issue(s) this PR fixes?

_Fixes #OCM-16226

Special notes for your reviewer:

Pre-checks (if applicable):

• Tested latest changes against a cluster

• Included documentation changes with PR

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: gdbranco
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[openshift-ci]

@gdbranco: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/checklinks-pr	99f26de	link	false	/test checklinks-pr

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[openshift-bot]

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