[3541483] Warn when provider/model is invalid in AI form helper.

Joshua Fernandesrequested to merge
issue/ai-3541483:3541483-alert-provider-invalid into 1.2.x

Show user warning on invalid AI provider/model in generateAiProvidersForm

  • Catch exceptions from createInstance/getAvailableConfiguration and add a messenger warning that selection was reverted to default

Closes #3541483

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