🐛Source Mongo: Fix connector's support level marker

[DanyloGL]

As source-mongodb-v2 connector is Certified, Support Level marker was updated to 200.

What

Connector was marked as Certified.

How

metadata.yaml file was updated with sl:200 marker.

🚨 User Impact 🚨

no breaking changes

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Name	Status	Preview	Comments	Updated (UTC)
airbyte-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 22, 2024 10:38am

[github-actions]

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