Remove cell_type from GMS

LIMS has deleted the CELL_TYPE column on their database so we can no longer rely on it existing in GMS.

This removes the Sample attribute, the view code, the sync code and other miscellaneous mentions of cell_type from Genome.

I imagine that there will be some test failures and I think we'll probably need a new blessed ClinSeq build as a result.
There's a trailing tab left here.