Any proceeding before the Board shall be terminated when an employee or applicant who is alleging violation of Title VII of the Civil Rights Act of 1964, as amended, 42 U.S.C. 2000e-16,Title,42.S.C. 12101 et seq., the Age Discrimination in Employment Act, 29 U.S.C. 633a,or,29.S.C. 791, files suit in Federal District Court on the same cause of action pending before the Personnel Appeals Board.