migrations: Remove noop migration operations.
migrations: Remove noop migration operations.

Since validators do not affect the database, this migration is a noop.
Removing the migration fails check-database-compatibility. We might
eventually delete it when Django supports a cleaner method for deletion.

TODO:
Remove the type annotation when django-stubs is integrated.

Signed-off-by: Zixuan James Li <74923aee05c23ca90566381b5d6b0cd9451b6054@gmail.com>

zulip/zulip,rht/zulip,rht/zulip,andersk/zulip,rht/zulip,andersk/zulip,zulip/zulip,zulip/zulip,rht/zulip,rht/zulip,zulip/zulip,zulip/zulip,andersk/zulip,rht/zulip,zulip/zulip,zulip/zulip,andersk/zulip,andersk/zulip,andersk/zulip,andersk/zulip,rht/zulip