Fix "upgrade in progress" status page not showing up while migration is in progress (#14579)

Web container does not need to wait for migration

if the database is running and responsive, but migrations have not finished, it will start serving, and users will get the upgrading page

wait-for-migration prevent nginix and uwsgi from starting up to serve the "upgrade in progress" status page

tools/ansible/roles/dockerfile/files/launch_awx_web.sh

@@ -15,6 +15,4 @@ fi
 
 set -e
 
-wait-for-migrations
-
 exec supervisord -c /etc/supervisord_web.conf