“Yellowjackets” actor Kevin Alves says there’s been “lots of tears of joy” since he and his co-stars received the final two scripts for the survival saga last week. “Reading that was a lot of emotional stuff for everybody,” the Toronto-born Alves says by phone from Vancouver, where the series has been shooting since February. “You know, seeing how the show’s ending and that was really beautiful…. The environment on set has been incredible with t…