partners: add 'model' alias for consistency in embedding classes

[manuelescobar-dev]

Description: This PR introduces a model alias for the embedding classes that contain the attribute model_name, to ensure consistency across the codebase, as suggested by a moderator in a previous PR. The change aligns the usage of attribute names across the project (see for example here).
Issue: This PR addresses the suggestion from the review of issue #28269.
Dependencies: None

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[eyurtsev]

Needs this:

    model_config = ConfigDict(
        populate_by_name=True,
    )```

otherwise it's a breaking change. I'll add

[eyurtsev]

This is not a pydantic model -- that's not going to work, so revering changes here