Require unique model_key in GenerationNode, clean up model selection errors #2730
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Summary:
Updates GNode to require a unique model_key for each of its ModelSpecs. This will make sure we can identify the model used for generating a trial from the model_key attribute on GR, in case two models based on same registry entry are used (e.g., MBM).
Also updates some of the old error messages related to BestModelSelector.
Differential Revision: D62029739