fix: Add compound index when the indexed columns have the right size

At the place of migration 0043, the columns together are too long. So it
fails with
> 'Specified key was too long; max key length is 3072 bytes

After most migrations are ran, the columns are resized and do fit in
that index size limitation.

https://dev.mysql.com/doc/refman/8.0/en/innodb-limits.html
>  The index key prefix length limit is 3072 bytes for InnoDB tables that use DYNAMIC or COMPRESSED row format.

We already have the "max" size possible, going over the 3072 is not
possible.

apps/issuer/migrations/0043_auto_20180614_0949.py

@@ -17,8 +17,4 @@ class Migration(migrations.Migration):
             name='recipient_identifier',
             field=models.EmailField(db_index=True, max_length=768),
         ),
-        migrations.AlterIndexTogether(
-            name='badgeinstance',
-            index_together=set([('recipient_identifier', 'badgeclass', 'revoked')]),
-        ),
     ]

apps/issuer/migrations/0117_alter_badgeinstance_index_together.py

@@ -0,0 +1,17 @@
+# Generated by Django 3.2.25 on 2024-09-23 16:28
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('issuer', '0116_migrate_studyLoad_to_timeExtension'),
+    ]
+
+    operations = [
+        migrations.AlterIndexTogether(
+            name='badgeinstance',
+            index_together={('recipient_identifier', 'badgeclass', 'revoked')},
+        ),
+    ]