Remove post-install manifest if present (#1934)
Remove post-install manifest if present (#1934)

Signed-off-by: Pierangelo Di Pilato <bf2f29ea09b3cb50cb8a51bbebdb9b3cef9d9af1@redhat.com>
knative-sandbox/eventing-kafka-broker,knative-sandbox/eventing-kafka-broker,knative-sandbox/eventing-kafka-broker