MIAMI — As sea levels rose from climate change, a new study found, flooding in the underground garage at the beachside Champlain Towers South became more common. Much more common. Whether rising seas played a role in the collapse of the doomed Surfside condominium is unclear — and perhaps, unlikely — but the new research from Florida International University provides the data for what regular passersby have witnessed in the now-empty parking garage floor: Water rises and falls not just with rain but with the tides. It’s made the site of the tragedy a curious little observation tank, a window t…