[tf.data] Graduate the experiment `enable_bufferio_v2` and make it default for all tf.data input pipelines.
[tf.data] Graduate the experiment `enable_bufferio_v2` and make it default for all tf.data input pipelines.

PiperOrigin-RevId: 425725025
Change-Id: Id37818f2bbea416d9672302b7594ea3964cd4e29

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