Setting up Run4 Dev menu for TDAQ Phase-II developments

Added Run 4 menus of versions Dev, Physics and MC (with the intention that Physics and MC are kept empty for now). Name chosen to be Dev_pp_run4_v1.py to avoid having to rename the menu closer to the Run4 start. If you have comments on the name, please let me know.

Mapped to Run 3 L1 menu and added one unit test (TriggerMenuMT_HLT_Dev_pp_run4_v1_HLTReprocessing_prescale_ctest). No test in TrigValidation added so far.

Tagging @ebrost, @khoo , @sshaw , @tamartin , @aranzazu for info and commenting in case something doesn't look right.