Use convertModelName to avoid 422 errors

[tgenaitay]

Description

Users reported Continue's model strings like llama3.1-8b are returning 422 MODEL NOT FOUND errors.
Implementing _convertArgs and using _convertModelName in our Scaleway class is a fix tested locally.
Unless there's another way for Continue to enforce the model name conversion?

Checklist

• The relevant docs, if any, have been updated or created

Testing

This service is free while in beta, get your SCW_API_KEY in https://console.scaleway.com/iam/api-keys

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[sestinj]

this is the right way to do it, thanks!