Pass combined artifacts from nested workflows into downstream nodes (#12223)

* Track combined artifacts on workflow jobs

* Avoid schema change for passing nested workflow artifacts

* Basic support for nested workflow artifacts, add test

* Forgot that only does not work with polymorphic

* Remove incorrect field

* Consolidate logic and prevent recursion with UJ artifacts method

* Stop trying to do precedence by status, filter for obvious ones

* Review comments about sets

* Fix up bug with convergence node paths and artifacts

awx/main/models/jobs.py

@@ -743,6 +743,12 @@ class Job(UnifiedJob, JobOptions, SurveyJobMixin, JobNotificationMixin, TaskMana
             return "$hidden due to Ansible no_log flag$"
         return artifacts
 
+    def get_effective_artifacts(self, **kwargs):
+        """Return unified job artifacts (from set_stats) to pass downstream in workflows"""
+        if isinstance(self.artifacts, dict):
+            return self.artifacts
+        return {}
+
     @property
     def is_container_group_task(self):
         return bool(self.instance_group and self.instance_group.is_container_group)