By Valentina Za, Pamela Barbaglia and Elisa Anzolin MILAN (Reuters) – Oaktree has hired Morgan Stanley to sell a stake in Banca Progetto in a deal that could value the challenger bank at up to $565 million, one of the biggest transactions in Italy’s blooming digital bank industry, sources told Reuters. The U.S. investment firm launched Banca Progetto, which has 4.6 billion euros ($5.2 billion) in assets, in 2015 after buying 54.2% of small local bank Banca Popolare Lecchese from Nuova Banca Etruria, which was being liquidated. The deal saw Oaktree entering the Italian banking market just as th…