Add pre-upgrade helm hooks to StorageClass

After the introduction of FluxCD, there have been issues on
platform-integ-apps auto re-apply on SX to DX migration.

This change adds the following helm hooks that were missing from
StorageClass:
- "helm.sh/hook": "pre-upgrade, pre-install"
- "helm.sh/hook-delete-policy": "before-hook-creation"

Test Plan:

PASS: CentOS - Create platform-integ-apps tgz with these changes and
test the migration.
PASS: Debian - Create platform-integ-apps tgz with these changes and
test the migration.

Closes-bug: 1970443

Signed-off-by: Enzo Candotti <enzo.candotti@windriver.com>
Change-Id: I3aa2e8f6cbb7504f9a4bf368d90f130dd5131106

stx-platform-helm/stx-platform-helm/helm-charts/rbd-provisioner/templates/storageclass.yaml

@@ -1,6 +1,6 @@
 {{/*
 #
-# Copyright (c) 2018 Wind River Systems, Inc.
+# Copyright (c) 2018-2022 Wind River Systems, Inc.
 #
 # SPDX-License-Identifier: Apache-2.0
 #
@@ -18,6 +18,8 @@ metadata:
     {{- if eq $defaultSC $classConfig.name}}
     annotations:
         "storageclass.kubernetes.io/is-default-class": "true"
+        "helm.sh/hook": "pre-upgrade, pre-install"
+        "helm.sh/hook-delete-policy": "before-hook-creation"
     {{- end }}
     name: {{ $classConfig.name }}
 provisioner: {{ $provisioner }}