Tutorials: Rename OAI CN5G docker network interface name from 'demo-oai' to 'oai-cn5g' and remove commented lines

Replace oai-spgwu-tiny by the new oai-upf

Change UE IP network address blocks for a 'Private-Use' range. Address block 12.1.0.0/16 is for public use, so we should not use it for the UEs (https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml)

chore(ci-cn): starting 2023/06/22, CN5G  images do not support anymore env-variable-based deployment configuration

* A common YAML file shall be mounted
* Currently SPGWU-TINY is still using the old configuration scheme
  - But a new UPF is soon to be released

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Tutorials: upgrade to Ubuntu 22.04, UHD 4.3.0.0, docker-compose v2.12.2 and add more DNNs to docker-compose to avoid duplicated (default) values when parsing the file

Tutorials: updates to use 100 MHz with 2 DL layers MIMO to achieve 640 Mbps downlink throughput with a single UE (820 Mbps with 2 UEs)

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>