[release-1.6] 🐛 clusterctl: validate no objects exist from CRDs before deleting them

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #9808

/assign sbueringer

[sbueringer]

/lgtm
/approve

[sbueringer]

/lgtm cancel
/approve cancel

[sbueringer]

Had to fix context handling. So leaving reviews to other folks

/assign @chrischdi @fabriziopandini

[k8s-ci-robot]

@k8s-infra-cherrypick-robot: 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-apidiff-release-1-6	fec525b	link	false	/test pull-cluster-api-apidiff-release-1-6

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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[chrischdi]

/area clusterctl

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 469facdd44f5bb1820812a7d669c8cafb5775085

[sbueringer]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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