Draft: Add test for writing dst with DaVinci

Davide Fazzinirequested to merge
dfazzini_test_write_dst into master

Add a test checking DaVinci can run a selection algorithm and persist the candidates in a new .dst file.

Closes https://gitlab.cern.ch/lhcb-dpa/project/-/issues/238

Edited by Patrick Koppenburg

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