PHOTOS BY JOEY SBARRO Scott McGowan and Emaline Williams co-star in “Life’s Work” at Vivid Stage in Summit. It’s a subtext to many romantic comedies: One partner is a struggling artist or has a dream he or she wants to follow. The other is more concerned with paying the bills. This takes many different forms, in many different plays and movies, but … that kind of thing. In Laura Ekstrand’s “Life’s Work” — a comedy/drama that Vivid Stage is currently presenting at the Oakes Center in Summit, in its world premiere — the subtext takes center stage. Ekstrand (who is also Vivid Stage’s artistic dir…