Remove NR L2 simulator code from UE This MR removes NR (SA and NSA) L2 simulator from the codebase. The code, at least at the UE side, was done at a time where there was no clear L2/L1 split leading to a complex implementation that never worked as expected. The L2 simulator has been broken and removed from testing for long time and, once it needs to be revived, it would require a complete new implementation.