By Daniel Chavkin The former 2020 fourth-round pick spent last year in the USHL. The Bruins announced Friday that they’ve signed Mitchell Miller to an entry-level contract. Miller was originally drafted by the Coyotes in 2020, but the team renounced him as its draft pick three days later after it was revealed that he bullied a Black classmate with a developmental disability in eighth grade. In 2020, the Arizona Republic reported that Miller and another classmate were charged in an Ohio Juvenile Court for assaulting Isaiah Meyer-Crothers. The incident included tricking Meyer-Crothers into licki…