WASHINGTON — The Supreme Court said Wednesday it was wrong to wade into a dispute involving a Trump-era immigration rule that the Biden administration has abandoned, so the justices dismissed the case.The court had said it would answer the question of whether Republican-led states, headed by Arizona, could pick up the legal defense of the Trump-era “public charge” rule that denied green cards to immigrants who use food stamps or other public benefits.The high court heard arguments in the case in February …