The Giants will have four primetime games this season — no doubt there is a John Harbaugh Factor at work here — and two of those nationally televised games come in the first two weeks of the season. That sets up stiff challenges in back-to-back weeks as Harbaugh embarks on his head coaching debut with the Giants. There is a “Sunday Night Football” season opener against the Cowboys at MetLife Stadium, followed by a Week 2 “Monday Night Football” encounter with the Rams at SoFi Stadium in