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

Unit testing added for new functions
    - UpdateVcaStatus in test_n2vc_juju_conn.py
    - GetExecutedActionsTest in test_libjuju.py
    - GetApplicationConfigsTest in test_libjuju.py

Change-Id: I7d750d8c39bc7bc061568c28d29f53d1b87c4c23
Signed-off-by: gspri <priyadharshini.g@tataelxsi.co.in>
Signed-off-by: ksaikiranr <saikiran.k@tataelxsi.co.in>