feat(aws): enable shared IAM role in e2e

[sjenning]

Enable the use of a single shared IAM role for all test clusters except TestCreateCluster.

Follow on for #7331

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

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✨ Finishing touches

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[sjenning]

/test e2e-aws

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sjenning

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[sjenning]

/test verify

[sjenning]

/test e2e-aws-minimal

[openshift-ci]

@sjenning: 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/e2e-aws	18916a0	link	true	/test e2e-aws

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