Merge branch 'integration_2024_w26' into 'develop'

Integration: `2024.w26`

See merge request oai/openairinterface5g!2815

* !2750 Add Ubuntu 24.04 to/retire Ubuntu 18.04 from supported distributions, use Ubuntu 22 for CI container images
* !2793 Option '-O' in phy simulators to provide a configuration file
* !2797 Increase TX_DATA.request TB buffer size, fix compute_PDU_Length
* !2814 Update documentation and FEATURE SET
* !2720 Remove thread-pool Makefile
* remove extra log