Do not compute and output thinned LAr digits by default

Tadej Novakrequested to merge
tadej/athena:lar-thinned into master

Do not compute and output thinned LAr digits by default. This otherwise causes some issues with running trigger in 21.0. This information is not needed in reconstruction. Introduces a new flag AddCaloDigiThinned.

Also fixes ATLASSIM-5093.

/cc @gunal @jchapman @pavol @wlampl

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