agent: Refine language model selector (#28597)

Release Notes:

- agent: Show recommended models in the agent model selector and display
the provider in the model selector's trigger.

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Co-authored-by: Danilo Leal <daniloleal09@gmail.com>
Co-authored-by: Danilo Leal <67129314+danilo-leal@users.noreply.github.com>

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