revert: Removing save_far_later models (#32712)

This is the second phase of removing save_for_later app in which migrations would be run to drop the DB tables.

VAN-1451

common/djangoapps/util/tests/test_db.py

@@ -3,7 +3,6 @@
 from io import StringIO
 
 import ddt
-import unittest
 from django.core.management import call_command
 from django.db.transaction import TransactionManagementError, atomic
 from django.test import TestCase, TransactionTestCase
@@ -121,7 +120,6 @@ class MigrationTests(TestCase):
     Tests for migrations.
     """
 
-    @unittest.skip("Migration will delete several models. Need to skip not referencing it first.")
     @override_settings(MIGRATION_MODULES={})
     def test_migrations_are_in_sync(self):
         """

lms/djangoapps/save_for_later/migrations/0003_auto_20230711_1431.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.2.20 on 2023-07-11 14:31
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('save_for_later', '0002_auto_20220322_1621'),
+    ]
+
+    operations = [
+        migrations.DeleteModel(
+            name='SavedCourse',
+        ),
+        migrations.DeleteModel(
+            name='SavedProgram',
+        ),
+    ]