add database field for ordering approvers
add method to retrieve approvers by position
only order approvers by position for linear groups
group #approvers specs
made Dispatcher module in preparation for linear flow support
[#82591368] Allow CORS requests
[#82591368] Added specs for CORS
convert dispatcher to a class

makes subclass methods easier to work with
make approval delivery method name more clear
validate UserRole#role
copy the position into the approval
[#82591368] Update controller filters for CORS
add LinearDispatcher (incomplete)
throw error if model creation fails in specs
store the flow on the cart
add linear approval integration spec
make a helper for getting email delivery recipients
refactor linear approval spec
email subsequent recipient when approval is received
[#82591368] Made the router more explicit in handling send_cart endpoint. Updated headers