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As for Trafford, i know it sounds harsh for him to have Donnarumma come as a new goalie, but this is a part of process. He has to compete with Donnarumma for the first spot. I'm sure that competition will push him to break his limit. He's a good goalie, but bring a competition for him is a must.
Trafford started his career in Man City and is returning to the club from Burnley. He's a good future prospect but is only 22 years old, so might be a bit too young to be a main goalkeeper. They will probably put him on the bench as a back up but he will be getting a lot of chances in less important games etc.
Ederson is already in talks with Galatasaray and is rumoured to be set to leave very soon. I'm not sure what will happen to Ortega, he's on a transfer list but I'm not sure if there are any takers. He probably doesn't want to stay with the club as he will unlikely to make any appearance at all. He was signed as a free agent so I don't expect Man City would be asking much for him.