Decline Contract Request tests

n/n	Description	Inputs	expected result	actual result
DCR1	Decline Contract Request without scope	token id json	403
DCR2	Decline Contract Request by other role than `NHS ADMIN SIGNER`	token NHS_OWNER id json	403	403
DCR3	Decline Contract Reuqest in status<>'NEW'	token id request in status<>NEW	422	422, Incorrect status of contract_request to modify it
DCR4	Decline Contract Reuqest with ID doesn't exist	token id doesn't exist	404	404,
DCR5	Decline contract request with not fulfilled updated fields	token id not updated request	200	200
DCR6	Decline contract Request		200, status = 'DECLINED', event added to event_manager	200