integration_2023_w27

See merge request oai/openairinterface5g!2218

* !2163 CI: use same Ping functionality everywhere
* !2173 Remove RFSIMULATOR environment variable; rename two env vars, add one; documentation
* !2205 Add support for NR band n48
* !2211 Fix bug
* !2213 CI: AW2S pipeline - disable retransmissions check
* !2133 Add E2 agent
* !2208 Bugfix when deleting a SDAP entity
* !2195 remove redundant copies of pdu sessions list
* !2174 Refactor CMakeLists.txt
* !2167 CI: Creation of pipeline for OAIUE testing
* !2165 improvements in CI config files

Changes for:
- phytest-dora config file
- rfsim-phytest-dora-106prb
- phytest-dora-106prb-usrpn300
- lte-2x2-tm1
- lte-2x2-tm2
- NSA-2x2
- 4g-rfsim-mbms-fembms
- 5grfsim-fr2-32prb
- nsa-2x2-quectel
- 5g-rfsim-24prb
- test xml

Fix multiple PDUSessions after review, now DRBs are configured sequentially, no matter what PDUSession id we receive

- Add E2 agent that leverages FlexRIC e2ap library
- Add documentation in openair2/E2AP/README.md
- Currently, statistics exported are random