The Indian-born financier who helped open the floodgates to Middle Eastern wealth for Masayoshi Son’s $100 billion Vision Fund is attempting his second act. This time, he’s going solo. At SoftBank Group Corp.’s splashy tech vehicle, Rajeev Misra helped secure commitments worth $45 billion from Saudi Arabia’s Public Investment Fund and $15 billion from Abu Dhabi’s Mubadala Investment…