[BUG][opensearch] Chart not installing in PSP enabled kubernetes clusters >= 1.21.

[chbmuc]

Describe the bug
Chart not installing in Kubernetes clusters >= 1.21 with PodSecurityPolicies enabled.

This is because the chart want's to use apiVersion: policy/v1. However there is no such apiVersion and there never will be. podSecurityPolicys have been deprecated, because they will be removed completely in future Kubernetes versions.

To Reproduce
Steps to reproduce the behavior:

1. Requirement: PSP enabled kubernetes cluster >= 1.21
2. helm install opensearch --set=podSecurityPolicy.create=true --set=rbac.create=true opensearch/opensearch
3. Error: INSTALLATION FAILED: unable to build kubernetes objects from release manifest: unable to recognize "": no matches for kind "PodSecurityPolicy" in version "policy/v1"

Expected behavior
Chart should install with a warning about the deprecation.

Chart Name
opensearch

Host/Environment (please complete the following information):

• Helm Version: 3.7.1
• Kubernetes Version: 1.21.5

Additional context
Suggested patch:

--- a/charts/opensearch/templates/podsecuritypolicy.yaml
+++ b/charts/opensearch/templates/podsecuritypolicy.yaml
@@ -1,10 +1,6 @@
 {{- if .Values.podSecurityPolicy.create -}}
 {{- $fullName := include "opensearch.uname" . -}}
-{{- if semverCompare ">=1.21-0" .Capabilities.KubeVersion.GitVersion -}}
-apiVersion: policy/v1
-{{- else -}}
 apiVersion: policy/v1beta1
-{{- end }}
 kind: PodSecurityPolicy
 metadata:
   name: {{ default $fullName .Values.podSecurityPolicy.name | quote }}

[TheAlgo]

@chbmuc Thanks for bringing this up. Do you plan of raising PR for it?