🐛 Remove GetPolicy IAM call when attaching to role

[adammw]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Alternative solution to #5265 that uses principle of least privilege by removing the need for iam:GetPolicy entirely. If the policy doesn't exist, assume that the AttachPolicy call will fail rather than attempting to fetch it before attachment.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #5254

Special notes for your reviewer:

Checklist:

• squashed commits
• includes documentation
• includes emojis
• adds unit tests
• adds or updates e2e tests

Release note:

Remove GetPolicy IAM call when attaching to role

[k8s-ci-robot]

Hi @adammw. Thanks for your PR.

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[richardcase]

/ok-to-test

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/lifecycle stale

[damdo]

/remove-lifecycle stale

[k8s-ci-robot]

@adammw: 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
pull-cluster-api-provider-aws-e2e-blocking	958b10f	link	true	/test pull-cluster-api-provider-aws-e2e-blocking

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[damdo]

@adammw this will need rebasing

[k8s-ci-robot]

PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.