Description

Closes #3940

Problem:

• When you try to configure the tabAutocompleteModel, some options have the description of another service. For example, Ollama have the description of the togetherai service.

Solution:

• I reordered the providers enum and added missing description for Nebius and VertexAI providers.
• For better understanding pelase look at the before and after screenshots.

Checklist

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

Screenshots

Before

Here, Ollama have the description of the togetherai service.

After

Now, Ollama and other providers are showing their respective description

Testing instructions

[ For new or modified features, provide step-by-step testing instructions to validate the intended behavior of the change, including any relevant tests to run. ]