This film feels like a dark reimagining of “Jack and Jill,” mixed with the unsettling atmosphere of “The Hills Have Eyes.” A group of young British people chooses to hike the isolated Gilmore Pass as a way to remember a friend who died by suicide. What they don’t know is that several other hikers have disappeared in the area recently. Things quickly go wrong. “The Legend of Jack and Jill” (2021), called simply …