Set elidable on RunPython operations in migrations

Any RunPython operation that only migrated existing data (that is, did
not create data) can be safely elided by Django when we run
`squashmigrations`.

pydis_site/apps/api/migrations/0043_infraction_hidden_warnings_to_notes.py

@@ -19,5 +19,5 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
-        migrations.RunPython(migrate_hidden_warnings_to_notes),
+        migrations.RunPython(migrate_hidden_warnings_to_notes, elidable=True),
     ]

pydis_site/apps/api/migrations/0044_migrate_nominations_from_infraction_to_nomination_model.py

@@ -60,5 +60,5 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
-        migrations.RunPython(migrate_nominations_to_new_model),
+        migrations.RunPython(migrate_nominations_to_new_model, elidable=True),
     ]

pydis_site/apps/api/migrations/0047_active_infractions_migration.py

@@ -100,6 +100,6 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
-        migrations.RunPython(migrate_inactive_types_to_inactive, reverse_migration),
-        migrations.RunPython(migrate_multiple_active_infractions_per_user_to_one, reverse_migration)
+        migrations.RunPython(migrate_inactive_types_to_inactive, reverse_migration, elidable=True),
+        migrations.RunPython(migrate_multiple_active_infractions_per_user_to_one, reverse_migration, elidable=True)
     ]

pydis_site/apps/api/migrations/0068_split_nomination_tables.py

@@ -58,7 +58,7 @@ class Migration(migrations.Migration):
             bases=(pydis_site.apps.api.models.mixins.ModelReprMixin, models.Model),
             options={'ordering': ('-inserted_at',), 'verbose_name_plural': 'nomination entries'}
         ),
-        migrations.RunPython(migrate_nominations, unmigrate_nominations),
+        migrations.RunPython(migrate_nominations, unmigrate_nominations, elidable=True),
         migrations.RemoveField(
             model_name='nomination',
             name='actor',

pydis_site/apps/api/migrations/0074_voice_mute.py

@@ -32,5 +32,5 @@ class Migration(migrations.Migration):
             name='type',
             field=models.CharField(choices=[('note', 'Note'), ('warning', 'Warning'), ('watch', 'Watch'), ('mute', 'Mute'), ('kick', 'Kick'), ('ban', 'Ban'), ('superstar', 'Superstar'), ('voice_ban', 'Voice Ban'), ('voice_mute', 'Voice Mute')], help_text='The type of the infraction.', max_length=10),
         ),
-        migrations.RunPython(migrate_infractions, unmigrate_infractions)
+        migrations.RunPython(migrate_infractions, unmigrate_infractions, elidable=True)
     ]

pydis_site/apps/api/migrations/0084_infraction_last_applied.py

@@ -22,5 +22,5 @@ class Migration(migrations.Migration):
             name='last_applied',
             field=models.DateTimeField(default=django.utils.timezone.now, help_text='The date and time of when this infraction was last applied.'),
         ),
-        migrations.RunPython(set_last_applied_to_inserted_at)
+        migrations.RunPython(set_last_applied_to_inserted_at, elidable=True)
     ]

pydis_site/apps/api/migrations/0087_alter_mute_to_timeout.py

@@ -21,5 +21,5 @@ class Migration(migrations.Migration):
             name='type',
             field=models.CharField(choices=[('note', 'Note'), ('warning', 'Warning'), ('watch', 'Watch'), ('timeout', 'Timeout'), ('kick', 'Kick'), ('ban', 'Ban'), ('superstar', 'Superstar'), ('voice_ban', 'Voice Ban'), ('voice_mute', 'Voice Mute')], help_text='The type of the infraction.', max_length=10),
         ),
-        migrations.RunPython(rename_type, migrations.RunPython.noop)
+        migrations.RunPython(rename_type, migrations.RunPython.noop, elidable=True)
     ]

pydis_site/apps/api/migrations/0088_new_filter_schema.py

@@ -163,7 +163,8 @@ class Migration(migrations.Migration):
         ),
         migrations.RunPython(
             code=forward,  # Core of the migration
-            reverse_code=lambda *_: None
+            reverse_code=None,
+            elidable=True,
         ),
         migrations.DeleteModel(
             name='FilterListOld'

pydis_site/apps/api/migrations/0092_remove_redirect_filter_list.py

@@ -13,4 +13,4 @@ class Migration(migrations.Migration):
         ("api", "0091_antispam_filter_list"),
     ]
 
-    operations = [migrations.RunPython(forward)]
+    operations = [migrations.RunPython(forward, elidable=True)]