ATR-19320, adding muon chain for high pT tops

Adding mu26noL1_FTKFS to MC_pp_v8, incl update to TErenaming in muXX_noL1.

Test logs are in ~astruebi/public/MenuTests/TM-0402-21.3.

Tagging @jmontejo and @aranzazu as this originally should go into todays nightly and @sshaw for muons.

Cheers, Antonia