feat(gitalyctl): enable migration again
What
Enable the migration for https://gitlab.com/gitlab-com/gl-infra/production/-/issues/17002
Why
We had to temporary stop the migration because of gitlab-com/gl-infra/production#17004 (closed), now that it's resolved we can contunie the migration.
Reference: https://gitlab.com/gitlab-com/gl-infra/production/-/issues/17002