What is the name of a metasploit payload type that is referred to as an inline payload?

In Metasploit, an inline payload is referred to as “Singles.”

Singles payloads are standalone and self-contained, meaning they perform their intended function without needing to be combined with other payloads. They are designed to execute a simple action, like opening a command shell or adding a user, and do not rely on a stager to load additional payload stages. This is in contrast to staged payloads, which are delivered in parts (stager and stage) to minimize the size of the initial payload.