remove `tpu_num_cores` (#41383)
* remove-tpu-num-cores
* fix
* let's remove it
* style
* Update examples/legacy/seq2seq/finetune_tpu.sh
Co-authored-by: Mohamed Mekkouri <93391238+MekkCyber@users.noreply.github.com>
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Co-authored-by: Mohamed Mekkouri <93391238+MekkCyber@users.noreply.github.com>
