By Valerie Volcovici and David Stanway DUBAI (Reuters) -COP28 President Sultan al-Jaber urged countries on Friday to get out of their comfort zones and work together to reach agreement before the two-week summit ends. “Let’s please get this job done,” he said, opening a plenary session as the summit entered its toughest phase of negotiations. “I need you to step up and I need you to come out of your comfort zones,” he said. With five days left before the conference’s scheduled end on Dec. 12, country ministers are joining the deliberations on Friday. Still unresolved is how the nearly 200 coun…