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9246ec6b - community[patch] : [Fiddler] ensure dataset is not added if model is present (#19293)

community[patch] : [Fiddler] ensure dataset is not added if model is present (#19293) **Description:** - minor PR to speed up onboarding by not trying to add a dataset, if a model is already present. - replace batch publish API with streaming when single events are published. **Dependencies:** any dependencies required for this change **Twitter handle:** behalder Co-authored-by: Barun Halder <barun@fiddler.ai>