test: wait for resource deletion during helm uninstall
test: wait for resource deletion during helm uninstall

The helm integration test was immediately removing both the cluster
and the operator charts, without waiting for any resource deletion
between the deletions. This causes intermittent failures in the
test since the cluster CR and mon secret and configmap to never
be deleted because the operator will be stopped before their
finalizers can be removed. Now we wait for their finalizers
to be removed before removing the operator chart.

Signed-off-by: Travis Nielsen <a8b474fdb3f77f44446f0ab9ddca8147b09b3a9e@redhat.com>

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