2316: Opt-out of preference

Update entity preference subscription status: Opt-out

Endpoint ID:	2316
Method:	PUT
URL:	/preferences/entity/id/{entityID}/preference/{preferenceID}/opt-out /preferences/entity/ext-key/{ext-key}/{ext-type}/preference/{preferenceID}/opt-out
	entityID	Rubiq master ID that uniquely identifies the entity
	ext-key	External key that uniquely identifies the entity
	ext-type	Type of external key
	preferenceID	A GUID string identifier for the preference
Request body:	A JSON object containing a `reason` property. { "reason": "No longer interested" } If the entity has not previously opted in to this preference, a `404` (sub code `404.6`) response will be returned instead of the success status `204`.
Response body:	None
Status codes:	204	OK
	404	The entity or preference were not found. The following sub codes may be returned: `404.1` Entity not found `404.2` External entity reference not found `404.4` Preference not found `404.6` Subscription not found