Two groups of hikers were rescued in quick succession after they trekked out to the same closed portion of a Columbia River Gorge trail, authorities said. The first pair, ages 15 and 16, called 911 Thursday night after getting stranded on a cliff, the Multnomah County Sheriff’s Office said. Search and rescue crews from the sheriff’s office were deployed along with more than two dozen volunteers to scour the wilderness for the teens, finding them…