Ryan Callahan will not be back on ESPN for the network’s hockey coverage this season.  The former beloved Ranger announced on social media that he was “taking a step away” for the season after four years as an analyst on the Worldwide Leader, revealing the decision on Tuesday, just hours before the Blueshirts were set to open their season against the Penguins at the Garden on ESPN.  “It has been a great four years with the worldwide Leader in Sports,” Callahan wrote on X . “I’m going to miss