Add additional asserts and update post training readme #1300
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-Add an assert to block dpo/kto/rm training when running pipeline parallel, as get_batch_pipe does not have the relevant logic yet
-Add assert when kto + train_micro_batch_size_per_gpu == 1 since kto needs a reference
-remove python post-training/llama_dpo_data.py as this file does not exist and is not nessesary to get the code running