Billionaire John Catsimatidis is taking a swing at leading a minor-league baseball team as they gear up for opening weekend.  The mogul behind Gristedes supermarkets and conservative radio network WABC was gearing up for the Staten Island FerryHawks’ opening weekend after adding Atlantic League managing partner to his resume. “It’s just a wonderful day,” Catsimatidis, who spent years supporting the Yankees-affiliated team, told The Post on Friday.  Billionaire John Catsimatidis will take part in the Staten Island FerryHawks’ opening weekend festivities while discussing the previous affiliated Staten Island Yankees and developments with the team’s current stadium. James Messerschmidt “When the Yankees called me up about four years ago and they wanted to be partners – I said absolutely yes I love baseball.…