The protester who tried to crash the Met Gala didn't get very far ... because New York's Finest surrounded the dude in a showing that put the Jets and Giants to shame. We've got new video from the scary moment outside the venue Monday ... it starts when the protester shows photographers a sign calling out Amazon for refusing to negotiate a union contract with employees at JFK8, an Amazon warehouse on Staten Island. Warehouse workers voted to unionize in 2022 ... but the company has refused to