CORE-5832 CORE-5955 Refactored collaborator endpoints.

Moved collaborator endpoints into Donkey only.
CORE-5386 Updated is_visibile parameter columns.

Updated the is_visibile column in the parameters and parameter_groups tables to default to true.
CORE-5386 All description columns are now TEXT types.
CORE-5386 Fixed data/11_app_categories.sql insert.

Fix for changes added in commit a351ab2ddd8bf461140ba3464dfe7cc1746cc077.
CORE-5955 Fix for collaborator endpoints.