(Corrects name of party to Progressive Party in third paragraph) BRASILIA, Feb 1 (Reuters) - Brazil’s Senate on Monday chose a lawmaker endorsed by President Jair Bolsonaro to head the upper chamber, giving the far-right leader a base among center-right politicians with whom he had once vowed never to ally. Senator Rodrigo Pacheco won a two-year leadership term by a vote of 57-21. Another new Bolsonaro ally, Arthur Lira of the right-wing Progressive Party, is expected to win the speakership of the lower house later on Monday. Bolsonaro’s support for Pacheco and Lira underscore his embrace...