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685bdd62 - refactor autoencoder tests (temporal decoder, cosmos, kvae, mochi) (#13832)

refactor autoencoder tests (temporal decoder, cosmos, kvae, mochi) (#13832) * refactor autoencoder_kl_temporal_decoder tests * refactor autoencoder_kl_cosmos tests * refactor autoencoder_kl_kvae tests * fix return_dict propagation in AutoencoderKLMochi.forward * refactor autoencoder_kl_mochi tests * add docstrings * fix return type annotation * remove unused base_precision and test_outputs_equivalence skip --------- Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>