AAP-44233 Create credential types in new migration step (#6969)

* Update database to credential types in new migration file

* bump migration

* Add assertion

* Pre-delete credentials so we test recreation

awx/main/migrations/0201_create_managed_creds.py

@@ -0,0 +1,20 @@
+from django.db import migrations
+
+# AWX
+from awx.main.models import CredentialType
+from awx.main.utils.common import set_current_apps
+
+
+def setup_tower_managed_defaults(apps, schema_editor):
+    set_current_apps(apps)
+    CredentialType.setup_tower_managed_defaults(apps)
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ('main', '0200_template_name_constraint'),
+    ]
+
+    operations = [
+        migrations.RunPython(setup_tower_managed_defaults),
+    ]