Added LCG 102b_LHCB_7
Note that some platforms have been disabled wrt to LCG_102b because not built upstream, and for our centos9-gcc11-dbg builds we use the upstream centos9-gcc11-opt builds.
command: ./utils/new_lcg_version.py 102b_LHCB_7 @LCG_102b_LHCB_7/platforms.txt