"The Act's conference agreement ... makes clear that a contract that was in place prior to November 2, 2017, and that is renewed after that date, will be treated as a new contract that will no longer qualify for the transition rule. The requirement of a written binding contract under the transition rule raises issues such as whether a contract or plan subject to the compensation committee's discretion to adjust a performance award downward will result in the contract being ineligible for the transition rule."