DALLAS—Luka Doncic says he will miss Kristaps Porzingis after the Dallas Mavericks traded the player who never quite measured up as the European sidekick to the team’s young superstar. Never mind what the game showed just a few hours after the deal at the trading deadline. Doncic scored 28 of his career-high 51 points in the first quarter, and the Mavericks beat the Los Angeles Clippers 112–105 on Thursday night. The 22-year-old’s 3-point frenzy, part of the highest-scoring quarter in the NBA this season, came soon after the franchise decided to end at two-plus seasons a pairing that never delivered the way the club hoped after the blockbuster with the New York Knicks in 2019. “We were building something great, although obviously it didn’t work out,” Doncic said. “I wish him the best.” Despite Doncic hitting seven of his first nine 3s in the highest-scoring quarter of his career, regular …