SAN FRANCISCO — The Dallas Mavericks’s dominant performance in Game 7 of the Western Conference semifinals series Sunday against the Phoenix Suns was a look at what’s to come for the Warriors. The Mavericks, behind superstar Luka Doncic, sent the Suns packing for their end-of-season vacations much sooner than anticipated with a Game 7 victory. Dallas kept Phoenix to just 27 points and outscored its opponent by 30 at the half en route to the Mavericks’ series-clinching victory over the league’s best team during the regular season. The 64-win Suns was the more balanced team of the two, but the M…