Check for DeletePlacementGroup permission before destroying cluster

[JoelSpeed]

This is a follow up to #5528 so that we ensure that the credentials provided to the installer have permission to delete the placement groups before we attempt to delete them.

This was highlighted as required by @staebler during a review of the enhancement

[staebler]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: staebler

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[openshift-bot]

/retest-required

Please review the full test history for this PR and help us cut down flakes.

[openshift-bot]

/retest-required

Please review the full test history for this PR and help us cut down flakes.

[openshift-bot]

/retest-required

Please review the full test history for this PR and help us cut down flakes.

[openshift-bot]

/retest-required

Please review the full test history for this PR and help us cut down flakes.

[openshift-bot]

/retest-required

Please review the full test history for this PR and help us cut down flakes.

[openshift-bot]

/retest-required

Please review the full test history for this PR and help us cut down flakes.

[openshift-ci]

@JoelSpeed: The following tests 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/okd-e2e-aws-upgrade	6567d1d	link	false	/test okd-e2e-aws-upgrade
ci/prow/e2e-aws-workers-rhel8	6567d1d	link	false	/test e2e-aws-workers-rhel8
ci/prow/okd-e2e-aws	6567d1d	link	false	/test okd-e2e-aws

Full PR test history. Your PR dashboard.

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