Feature-9904: Enhancing NG-UI to enable Juju operational view dashboard

In ns.py file

Added _on_update_k8s_db function to update KNF vcaStatus in NSR record
Integrated the vca status refresh function for updating KNF status

Change-Id: Ieba74e3d6d45766ad4b808665a3c62b046a42b2a
Signed-off-by: jayaramans <selvi.j@tataelxsi.co.in>
Signed-off-by: ksaikiranr <saikiran.k@tataelxsi.co.in>