[release-1.6] 馃悰 Watch external objects for machine before deleting #10177
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This fixes a race condition in the machine controller when the controller is restarted after a machine has been marked for deletion but before the infra machine or bootstrap config are deleted. In that case, the controller doesn't have watches on those external objects, so the reconciliation is not triggered once they are deleted. This means that Machines stay in Deleting state for the resync period, the default is 10 minutes.
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Backport of #10041
What this PR does / why we need it:
This fixes a race condition in the machine controller when the controller is restarted after a machine has been marked for deletion but before the infra machine or bootstrap config are deleted. In that case, the controller doesn't have watches on those external objects, so the reconciliation is not triggered once they are deleted. This means that Machines stay in Deleting state for the resync period, the default is 10 minutes.
/area machine