Changes to Remove connector instance

added the optional property message to the response with the 400 status

the endpoint scheme security bearerAuth was added to the API

the endpoint scheme security denApiKey was added to the API

added the optional property capability to the response with the 400 status

removed the pattern ^cin_.* from the path request parameter connectorInstanceId

the item/removedConnectorInstanceId response's property pattern ^cin_.* was removed for the status 200