[3.1.x] Fixed #32012 -- Made test database creation sync apps models when migrations are disabled.

Thanks Jaap Roes for the report.
Backport of 77caeaea88 from master

tests/backends/base/app_unmigrated/migrations/0001_initial.py

@@ -0,0 +1,17 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    initial = True
+
+    dependencies = []
+
+    operations = [
+        migrations.CreateModel(
+            name='Foo',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=255)),
+            ],
+        ),
+    ]