By Lucy Raitano LONDON (Reuters) - Nebius Group said on Wednesday it would raise $3 billion to fuel growth in its core artificial intelligence cloud business, on the heels of its$17.4-billion deal with Microsoft. The financing includes a $2 billion private offering of convertible senior notes and a$1 billion underwritten public offering of the company's class A shares. Goldman Sachs is lead book-running manager on the public offering alongside Morgan Stanley, BofA Securities and Citigroup as additiona ...