[bitnami/kubewatch] Add priorityClassName support (#5720)

This is copied from the memcached chart.

Testing was done like so:
```
helm dependency build kubewatch
helm package kubewatch
helm upgrade -i kubewatch ~/sources/charts-1/bitnami/kubewatch-3.1.4.tgz -f ~/tmp/kubewatch.yaml -n monitoring
```

which contains this:
```
priorityClassName: 'system-cluster-critical'
```

See that the change took effect:
```
$ kubectl get pods -n monitoring | grep kubewatch
kubewatch-758c5b9745-4rwl8                                        1/1     Running   0          8m34s
```

See that the spec matches:
```
$ kubectl get pod kubewatch-758c5b9745-4rwl8 -n monitoring -o template --template={{.spec.priorityClassName}}'
system-cluster-critical
kubectl get pod kubewatch-758c5b9745-4rwl8 -n monitoring -o template --template={{.spec.priority}}
2000000000
```

bitnami/kubewatch/Chart.yaml

@@ -28,4 +28,4 @@ name: kubewatch
 sources:
   - https://github.com/bitnami/bitnami-docker-kubewatch
   - https://github.com/bitnami-labs/kubewatch
-version: 3.1.4
+version: 3.2.0

bitnami/kubewatch/README.md

@@ -134,6 +134,7 @@ The following tables lists the configurable parameters of the Kubewatch chart an
 | `affinity`                  | Affinity for pod assignment                                                               | `{}` (evaluated as a template) |
 | `nodeSelector`              | Node labels for pod assignment                                                            | `{}` (evaluated as a template) |
 | `tolerations`               | Tolerations for pod assignment                                                            | `[]` (evaluated as a template) |
+| `priorityClassName`         | Controller priorityClassName                                                              | `nil`                          |
 | `podLabels`                 | Extra labels for Kubewatch pods                                                           | `{}`                           |
 | `podAnnotations`            | Annotations for Kubewatch pods                                                            | `{}`                           |
 | `extraVolumeMounts`         | Optionally specify extra list of additional volumeMounts for Kubewatch container(s)       | `[]`                           |

bitnami/kubewatch/templates/deployment.yaml

@@ -43,6 +43,9 @@ spec:
       {{- if .Values.tolerations }}
       tolerations: {{- include "common.tplvalues.render" (dict "value" .Values.tolerations "context" $) | nindent 8 }}
       {{- end }}
+      {{- if .Values.priorityClassName }}
+      priorityClassName: {{ .Values.priorityClassName | quote }}
+      {{- end }}
       restartPolicy: Always
       serviceAccountName: {{ include "kubewatch.serviceAccountName" . }}
       {{- if .Values.podSecurityContext.enabled }}

bitnami/kubewatch/values.yaml

@@ -241,6 +241,11 @@ nodeSelector: {}
 ##
 tolerations: []
 
+## Pod priority
+## ref: https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/
+##
+# priorityClassName: ""
+
 ## Pod extra labels
 ## ref: https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/
 ##