NEW YORK — In an extraordinary sign that Kyrie Irving may be fully available for the Nets later this year, two major figures, including the one with ultimate power, questioned New York City’s vaccine requirement for hometown pro athletes on Wednesday. Irving is the only player on either the Knicks or Nets who has refused to take a COVID-19 vaccine, leaving him ineligible for home games, and road games at Madison Square Garden (where the Nets visit Wednesday night). First up was NBA commissioner Adam Silver, who pointed out the bizarre fact that unvaccinated road players are eligible at Barclay…