It seemed like everyone at 270 Park Avenue was talking about Chirayu Rana. The 35-year-old banker was about six months off JPMorgan Chase’s payroll when he filed a lawsuit against the bank and his former co-worker, alleging a pattern of sexual assault and harassment. The details were salacious and shocking to his peers, who’d known him as a socially awkward, occasionally gruff finance bro.  JPMorgan hired Rana in 2024 to help build its business in the booming private-credit industry. The banker, who’d cut his teeth at Credit Suisse and Morgan Stanley, quickly got to work at the bank’s offices on…