Approval step status enum

Approval step status enum is a fixed list of values that Chalk uses for approval step status enum. The allowed values are PENDING, ACTIVE, APPROVED, DENIED, SKIPPED. A record can only ever hold one of these exact values, which keeps approval step status enum consistent across curriculum, assessment, faculty, scheduling, accreditation, and budget records, as well as the API. When you see one of these on a record, it is one of the defined approval step status enum states rather than free text, so reports and automations can rely on it.