Expose test utils to Labrinth dependents (#4703)

* Expose test utils to Labrinth dependents

* Feature gate `labrinth::test`

* Unify db migrators

* Expose `NotificationBuilder::insert_many_deliveries`

* Add logging utils to common crate

* Remove unused console-subscriber layer

* fix CI

apps/labrinth/src/database/models/notification_item.rs

@@ -160,7 +160,7 @@ impl NotificationBuilder {
         Ok(())
     }
 
-    async fn insert_many_deliveries(
+    pub async fn insert_many_deliveries(
         transaction: &mut sqlx::Transaction<'_, sqlx::Postgres>,
         redis: &RedisPool,
         notification_ids: &[i64],