reduced travis test matrix
removed unnessary flag is_for_modelling from suggsted_assay_type

its not needed and also avoid different between assay and tech type.
also removed some unused code - OPSK-34
turned suggested_type_handler into a concern and consolidated common features across controllers - OPSK-34
removed fixtures for suggested assay and tech types, as factories are used
abstracted out some of the common code for assay and tech types

and put into a shared module OPSK-34
removed the assay and technology type entities and tables OPSK-34

no longer needed and are obselete