Merge pull request #69487 from rhcs-dashboard/fix-4878

mgr/dashboard : Implement dependent resource handling for gateway Deletion

Reviewed-by: Nizamudeen A <nia@redhat.com>
Reviewed-by: Sagar Gopale <sagar.gopale@ibm.com>
Reviewed-by: Afreen Misbah <afreen@ibm.com>