Changes to Register (upsert) a phone's Expo push token

removed the agent_switch_saga enum value from the reporting_owner response property for the response status 400

removed the agent_switch_saga enum value from the reporting_owner response property for the response status 500

removed the agent_switch_saga enum value from the reporting_owner response property for the response status 501

added the new optional request property hostName

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

added the optional property reporting_owner to the response with the 500 status

added the optional property reporting_owner to the response with the 501 status

the response property device/token became optional for the status 200

added the new optional request property installId

the request property token became optional

endpoint added