AUSTIN—Healthcare experts are urging Texans to sign up for insurance at HealthCare.Gov by this Saturday, Jan. 15, the last day most people can sign up for 2022. Coverage will start on Feb. 1 for Texans who sign up by the deadline. Enrollment has already hit a record high in Texas, with more than 1.7 million Texans signing up at HealthCare.Gov from Nov. 1 through Dec. 15, 2021, with enrollment…