Add GenFit and HepMC as the dependencies of CEPC and Re-enable the CEPCSW and k4LCIOReader in key4hep-stack

[mirguest]

Hello all,

In this PR, there are two changes:

• CEPCSW will use GenFit in the tracking of drift chamber.
  • A new receipt of the package GenFit is added into spack. See New package GenFit spack/spack#20653.
• The migration to Gaudi v35 is done.
• Add k4Pandora.

Thank you!

Tao

[mirguest]

Hi @vvolkl ,

The CI failed due to the missing of GenFit receipt in https://github.com/key4hep/spack.
Should I create a new PR in the key4hep/spack repo?
Thank you!

Tao

[vvolkl]

Hi Tao @mirguest,

Yes, relevant new commits from upstream spack are cherry-picked on the key4hep fork, so you can just create a PR there if there are new upstream developments you need. For genfit, I already pushed it now.

[mirguest]

Hi Tao @mirguest,

Yes, relevant new commits from upstream spack are cherry-picked on the key4hep fork, so you can just create a PR there if there are new upstream developments you need. For genfit, I already pushed it now.

Hi @vvolkl ,
Thank you!
Tao

[vvolkl]

Thanks Tao! I'll make a new release as soon as key4hep/k4MarlinWrapper#25 is merged.