The creation of awx users is handled by the rpm. When the setup script for the package "automation-controller-server-4.x.x-x.el8ap.x86 64" is run, the awx user is created.
The user creation operation is handled by the package script. Commands can be used to verify that:
# rpm -q --scripts automation-controller-server-4.x.x-x.el8ap.x86_64
The awx user task present in the script of the package.
useradd -r -g awx -d /var/lib/awx -s /bin/bash awx <--- This will create a system user. The system users have id below the range uid < 1000