[master] Drop legacy MC generators

cmssw-tool-conf.spec

@@ -12,7 +12,6 @@ Requires: starlight
 Requires: alpgen
 Requires: boost
 Requires: bz2lib
-Requires: charybdis
 Requires: classlib
 Requires: clhep
 Requires: coral
@@ -40,14 +39,12 @@ Requires: hector
 Requires: hepmc
 Requires: hepmc3
 Requires: heppdt
-Requires: herwig
 Requires: herwig7
 Requires: hydjet
 Requires: hydjet2
 Requires: ittnotify
 Requires: jemalloc
 Requires: jemalloc-debug
-Requires: jimmy
 Requires: json
 Requires: ktjet
 Requires: lhapdf
@@ -59,7 +56,6 @@ Requires: libxml2
 Requires: lwtnn
 Requires: meschach
 Requires: pcre2
-Requires: photos
 Requires: photospp
 Requires: pyquen
 Requires: pythia6
@@ -76,10 +72,8 @@ Requires: ucx
 Requires: openmpi
 Requires: sigcpp
 Requires: sqlite
-Requires: tauola
 Requires: tauolapp
 Requires: thepeg
-Requires: toprex
 Requires: libuuid
 Requires: xerces-c
 Requires: dcap
@@ -96,7 +90,6 @@ Requires: grpc
 Requires: onnxruntime
 Requires: triton-inference-client
 Requires: hdf5
-Requires: cascade
 Requires: yoda
 Requires: fftw3
 Requires: fftjet