Job splitting access logic and more feature development

*allow sharding with prompts and schedules
*modify create_unified_job contract to pass class & parent_field name
*make parent field name instance method & set sharded UJT field
*access methods made compatible with job sharding
*move shard job special logic from task manager to workflows
*save sharded job prompts to workflow job exclusively
*allow using sharded jobs in workflows

awx/api/serializers.py

@@ -3590,7 +3590,7 @@ class WorkflowJobSerializer(LabelsListMixin, UnifiedJobSerializer):
 
     class Meta:
         model = WorkflowJob
-        fields = ('*', 'workflow_job_template', 'extra_vars', 'allow_simultaneous',
+        fields = ('*', 'workflow_job_template', 'extra_vars', 'allow_simultaneous', 'job_template',
                   '-execution_node', '-event_processing_finished', '-controller_node',)
 
     def get_related(self, obj):

awx/api/views/__init__.py

@@ -2905,7 +2905,7 @@ class JobTemplateLaunch(RetrieveAPIView):
             raise PermissionDenied()
 
         passwords = serializer.validated_data.pop('credential_passwords', {})
-        new_job = obj.create_job(**serializer.validated_data)
+        new_job = obj.create_unified_job(**serializer.validated_data)
         result = new_job.signal_start(**passwords)
 
         if not result: