Keras premade models: Change the API endpoints of LinearModel and WideDeepModel to `tf.compat.v1.keras.models.XModel`, and deprecate the existing experimental endpoints.
Keras premade models: Change the API endpoints of LinearModel and WideDeepModel to `tf.compat.v1.keras.models.XModel`, and deprecate the existing experimental endpoints.

PiperOrigin-RevId: 389204681
Change-Id: I60240bbaa7bc57025166e7a766d18f5f1102cf46

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