Release v2.8-pre

Replicates the ILCSoft release v02-08-MC with a newer version of the lcgeo package.
Versions of all the packages defined in ./environments/mucoll-release/packages.yaml

The following development packages added from the Key4hep stack:

doxygen
gdb
llvm
man-db
onnx
xgboost
py-h5py
py-ipython
py-jupytext
py-matplotlib
py-onnxruntime
py-onnx
py-pandas
py-particle
py-pip
py-scikit-learn
py-scipy
py-uproot
py-xgboost