Tests: restructure to more closely mirror the sources

t/ had lots of directories and files mirroring src/lib/Hydra. This moves those files under t/Hydra

Created by  Graham Christensen  on January 10, 2022
EBN3NCSU7USHEF7XOPQB2HA7S2BAJ3RNBMQ4LZRBJPHCQEF4JHCAC
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