Consistent app.kubernetes.io/part-of label for operator-managed resources

[aali309]

Operator adds app.kubernetes.io/part-of: argocd label on all it's managed resources. However for appset resources this label value is argocd-applicationset and not argocd. Not sure about the reason but the upstream uses argocd for this label in appset resources so we should follow the same in operator.

To Reproduce:

• Create a ArgoCD CR and enable applicationset

• Check the labels on applicationset resources like serviceaccount, roles, rolebinding

• Also enable other components and check for the app.kubernetes.io/part-of label on it's resources.