feat(changelog): add new entry

Author: Changelog bot

changelog/january2025/2025-01-16-mongodb-added-managed-mongodbr-in-public-beta.mdx

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+---
+title: Managed MongoDB® in Public Beta
+status: added
+author:
+    fullname: 'Join the #managed-mongodb-public-beta channel on Slack.'
+    url: 'https://slack.scaleway.com'
+date: 2025-01-16
+category: databases
+product: mongodb
+---
+
+Managed MongoDB® is now in Public Beta. [Connect to the console](https://console.scaleway.com/mongo-db/databases/fr-par) to try it out and refer to this [documentation](https://www.scaleway.com/en/docs/managed-databases/mongodb/) for more information.
+