Handles workflow node schema inventory

[db0]

SUMMARY

This makes the workflow_job_template handle the inventory passed to nodes in the schema properly

This is handled fine in workflow_job_template_node, but since workflow_job_template is using its own function, this functionality is missing. I simply copied the same approach from workflow_job_template_node and tested that it is working in my installation

Related #12720

ISSUE TYPE

Bug

COMPONENT NAME

Collection

AWX VERSION

I am using the Ansible Automation Platform 2.2.0 from RedHat, not AWX