Scooter Braun officially retired from music management this week after a whopping 23 years in the industry, RadarOnline.com can report. In a surprising development to come just two years after Braun unofficially stepped back from managing top artists like Justin Bieber and Ariana Grande, he announced on Monday that he was officially stepping back from being a manager. Instead, Braun revealed that he would now focus on being CEO of HYBE America – the company that he sold his Ithaca Holdings company to in 2021 – as well as his family. “23 years ago a 19 year old kid started managing an artist na…