Updates default for SM/Dedicated model selection

Eduardo Bonetrequested to merge
ebonet/sm-model-selection-update-what-is-default into master

What does this MR do and why?

Updates default for SM/Dedicated model selection

Better handles expected default state when a model selection does not exist on SM/Dedicated. If on offline license, or when self_hosted aigw url exists, we should not be defaulting to vendored

Changelog: changed EE: true

Context: !204026 (comment 2736812195)

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