Changes to Get order executions

removed the enum value firms/F-{platform_code}/users/{account_label} of the request property user

removed the enum value firms/F-{platform_code}/users/{participant_code} of the request property user

removed the enum value firms/{zerohash}/users/{platform_code} of the request property user

removed the firms/F-{platform_code}/users/{account_label} enum value from the executions/items/order/user response property for the response status 200

removed the firms/F-{platform_code}/users/{participant_code} enum value from the executions/items/order/user response property for the response status 200

removed the firms/{zerohash}/users/{platform_code} enum value from the executions/items/order/user response property for the response status 200