Hardly. Unless you know of some piece of lore I don't (in which case I apologize), the only hints we have of other galaxies are those visited by the Yuuzhan Vong (wiped out), and wherever Darth Revan went. All life of Star Wars lore would be wiped out by a single blast of the Halo Array (unless Force). Fortunately for Star Wars, I don't really think the Haloverse would do that, considering the OP didn't specify [i]where[/i] they were fighting. Thus, they would wipe themselves out as well. But they could and, knowing the Didact, might.