Filter the loaded models list

Problem/Motivation

At the moment, we load the list of models directly with the Gemini API. We do a check for embedings but other than that we just load the models directly.

We need to further filter (even hardcoding manually if needed) and load only those models which are at the moment supported by the module.

There are even some models which are returned twice by the API and it does not make any sense to directly pass.

Steps to reproduce

Check the models list in API Explorer.

Proposed resolution

Test every model in API explorer and make sure all works and there are no duplication.