[CN-1067] Add 'delete' Webhook to Hotbackup CRD for checking restore …

…references (#981)

* add deletion webhook to hotbackup

* integration test

* call deletion validation in finalizer

* add unit test

* check hazelcast if deleted in validation

Signed-off-by: devOpsHelm <devopshelm@hazelcast.com>

stable/hazelcast-platform-operator/templates/webhook.yaml

@@ -73,6 +73,7 @@ webhooks:
         operations:
           - CREATE
           - UPDATE
+          - DELETE
         resources:
           - hotbackups
     sideEffects: None