fix!: exclude remote models for .register()

[GarrettWu]

BEGIN_COMMIT_OVERRIDE
fix!: exclude remote models for .register() (#465)

Release-As: 0.26.0
END_COMMIT_OVERRIDE

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Fixes #<issue_number_goes_here> 🦕

[ashleyxuu]

Any reason we want to exclude remote models .register() for LLM class?

[GarrettWu]

Any reason we want to exclude remote models .register() for LLM class?

Those remote models can be registered, but can't be deployed in Vertex. There was a discrepancy in BQML that CREATE MODEL can't register on remote model types, but ALTER MODEL can. In theory, no reason to register an already deployed model endpoint.