Tutorials: update ubuntu iso download link to 22.04.2, update Windows Quectel driver version, remove nokrnmod flag, it is enabled by default

- CI_OC_RAN_NAMESPACE for RAN images
- CI_OC_CORE_NAMESPACE for CN deployment
- usage of the created constants for pulling images from cluster, CN deployement, iperf/ping

- IPERF3 option created in cls_oaicitest.py
- retrieval of CN amf and traffic-server IP address from pods
- modification of gNB config file (do_SRS set, max UL MCS increased), removal of unused config file
- change of AmariUE config file to support 2x2
- modification of xml file for aw2s pipeline - iperf test added
- new xml file for cleanup (terminate AmariUE, clean test server images) created

integration_2023_w20

See merge request oai/openairinterface5g!2116

* !2090 ldpc cuda memory size fix for bg2
* !2094 Add new parameter tx_amp_backoff_dB
* !2103 Utilizing c16_t instead of int16_t
* !2106 Removed ADB related parameters from args_parse.py
* !2112 Fix segmentation fault when PDUSession Release
* !2114 chore(ci): support new rhel8.8 version
* !2092 CI: Refactor ping, image-used fix, update thresholds

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

Provides the backoff from full-scale output at the L1 entity
(frequency-domain samples). Default is, 36 dBFS, which is the correct
value when using the OAI RU entity. For O-RAN RU, this value should be
set according to the O-RU manufacturer requirements. For example 12
would corresponding to 14-bit input level (6 dB/bit).

Applies the TX amp backoff to PBCH, PDCCH and CSI

Can be handled using static IP addresses, currently not used

Refactor ping: shorten function, don't use useless variables, PingNoS1 not supported (we don't use it)