NEW YORK — With a short-handed squad on the second leg of a back-to-back against the same Utah Jazz team who beat his Knicks by seven in December, head coach Tom Thibodeau beamed with confidence. It’s the moxie of the leader of a team on a historic run: The Knicks entered Tuesday’s matchup winners of 13 games in the 15 played in the month of January, then padded their record with a 118-103 victory over the Jazz on Tuesday. They have won 14 games in a month for the first time since 1994. The Knicks are riding a league-best eight-game winning streak. They also entered Tuesday’s game tied with th…