Treat instance_groups prompt as template-less

awx/main/models/jobs.py

@@ -292,7 +292,6 @@ class JobTemplate(UnifiedJobTemplate, JobOptions, SurveyJobTemplateMixin, Resour
                 'job_slice_number',
                 'job_slice_count',
                 'execution_environment',
-                'instance_groups',
             ]
         )
 
@@ -605,13 +604,6 @@ class Job(UnifiedJob, JobOptions, SurveyJobMixin, JobNotificationMixin, TaskMana
         default=1,
         help_text=_("If ran as part of sliced jobs, the total number of slices. " "If 1, job is not part of a sliced job."),
     )
-    instance_groups = OrderedManyToManyField(
-        'InstanceGroup',
-        related_name='job_instance_groups',
-        blank=True,
-        editable=False,
-        through='JobInstanceGroupMembership',
-    )
 
     def _get_parent_field_name(self):
         return 'job_template'