LOS ANGELES — Two months after his historic ouster as U.S. House speaker, Republican Rep. Kevin McCarthy said Wednesday that he is resigning and will leave Congress by the end of the year.His announcement capped a stunning end to a House career for the onetime deli counter owner from Bakersfield, California, who ascended through state and national politics to become second in line to the presidency, until a cluster of hard-right conservatives engineered his removal in October.McCarthy is the only speaker in history …