CI: adding support for the N300 gNB + NR-UE testing
-- pipeline is polling the develop-nr branch -- new conf file / new scenario files -- main python now supports LTE and 5G-NR executables in a Ubuntu/CentOS env
-- pipeline is polling the develop-nr branch -- new conf file / new scenario files -- main python now supports LTE and 5G-NR executables in a Ubuntu/CentOS env