- Enable build of T2 lib in RAN-gNB-N300-Timing-Phytest-LDPC
 - Add testcases with 2 layers

Add ulsch decoding measurements, which are reported by nr_ulsim. Start ulsch_decoding_stats measurement before
nr_ulsch_decoding is called and stop it after collection of all decoder tasks from Tpool. In the context of nr_ulsim,
ULSCH_id is allways == 0, testing is performed per one TB, therefore measurement is started and stopped only once per trial.
Reported ulsch decoding statistics show the mean ulsch decoding time over x trials (specified by -n command line option of nr_ulsim).
This measurement does not provide valid information in case of nr-softmodem, when the loop is done over multiple ULSCH IDs -
start of the measurement is done multiple times and stops only once in this case.
For unitary physical simulators, ULSCH processing loop is executed only once
- the max number of PUSCH is set to 1. This ensures exactly one start and stop
of the ULSCH decoding time measurement per processed TB.

Note: ulsch decoding statistics reports average time of segmentation, rate matching, interleaving and decoding of the TB

- Enable both nr_ulsim and nr_dlsim test with Run_T2Test
- Introduce time threshold variable for T2/CPU LDPC tests
  - Set threshold individually for each test - T2 encoding/decoding and CPU encoding/decoding
  - Check if encoder/decoder processing time is below the threshold
  - Remove NOK return option - keep only OK (processing time below threshold) or KO (proceesing time beyond threshold)
- Rename function to run and check results of CUDA ldpctest
- Use new SSH class in function for check T2 test results, use f-strings

- Modify T2 PCI adr for CI T2 test setup
- Set PKG_CONFIG_PATH env var manually if needed (DPDK lib installed into custom path)

Simplification of the code by replacing iperf_opt by target_bitrate (returned from Iperf_ComputeModifiedBW) - no need to repeat the steps to retrieve information about requested bitrate from iperf_opt. Compute iperf bitrate performance as receiver bitrate over requested (target) bitrate.
Fix an issue with misdetection of missing report line - "result" was defined 2x in the function. With this MR, result can be only None or stores output of re.search() for matching the report line pattern, which ensure proper detection of the report line as well as presence off all required components in the report line.

Sender bitrate is not always equal to the requested bitrate (set by "-b" iperf option) in iperf3 (v3.9) UDP tests, so we have to compture bitrate performance of UDP iperf3 test as receiver over requested bitrate. Bitrate performance then express percentage of requested bitrate, which is received on the receiver side.

For iperf3 (version 3.9) UDP, sender bitrate is not always equal to requested bitrate (defined by '-b' option). We need to retrieve information about the requsted bitrate from iperf command line options specified for each UDP testcase. This parameter is then used in UDP analysis functions for proper evaluation of the test results.

fixes the overflow issue in the PUCCH2 RX with 4+ RX antennas and 12+
bits (polar code format). The fix scales the polar decoding LLR
computation according to the number of RX antennas. The issue was clear
for 100 MHz 4 RX antennas. Even

  nr_pucchsim -s -5 -q 8 -P 2 -b 12 -R 273 -z4 -n1000

doesn't converge to 0 BLER with increasing SNR. The issue didn't appear
in CI because of the bandwidth and antenna count limitations.

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

Prior to this commit, it might happen that the gNB used TDA 0 (Start 0
len 13) for mixed slot, in which case the UE could not send msg3
(because a mixed slot has less than 13 symbols).

- It is only a couple of bytes
- It hid a bug: if two preambles, L1_nr_prach_procedures() overwrote the
  preamble of the first with the second one

if we reduce, we will never do all rach indications. Go one-by-one
instead.