Support use of PVC created dynamically via volumeClaimTemplates when persistence is enabled & existingClaim is not specified

[sivarama-p-raju]

The current templating logic on the statefulset does not support use of the PVC dynamically created by the claim template when Values.persistence.enabled is true and .Values.persistence.existingClaim is not specified.

Could you please let me know your thoughts about updating the below on the chart:

        {{- if and .Values.persistence.enabled .Values.persistence.existingClaim }}
        - name: {{ $fullName }}
          persistentVolumeClaim:
            {{- with .Values.persistence.existingClaim }}
            claimName: {{ tpl . $ }}
            {{- end }}
        {{- else if and .Values.persistence.enabled (not .Values.persistence.existingClaim) }}                # Add
        - name: {{ $fullName }}                                                                               # Add
          persistentVolumeClaim:                                                                              # Add
            claimName: {{ $fullName }}                                                                        # Add
        {{- else if not .Values.persistence.enabled }}
        - name: {{ $fullName }}
          emptyDir: {}
        {{- end }}