🧪 [Add missing test for mongodb module registration]

[Tcode-Motion]

🎯 What: Added missing unit test for the mongodb stdlib module registration.
📊 Coverage: Covered the register_mongodb function to ensure it properly adds the std.mongodb module and its connect export to the registry.
✨ Result: Improved test coverage and reliability for stdlib registry initialization.

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PR created automatically by Jules for task 11616446171150591367 started by @Tcode-Motion

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