As used in this article: (a) "Employee" does not include the following: (1) Except as provided in subdivision (d) of Section 246.5, an employee covered by a valid collective bargaining agreement if the agreement expressly provides for the wages, hours of work, and working conditions of employees, and expressly provides for paid sick days or a paid leave or paid time off policy that permits the use of sick days for those employees, final and binding arbitration of disputes concerning the application