Add `step` parameter to `TensorBoardLogger.log_hyperparams` (#20176)
* Add step to TensorBoardLogger.log_hyperparams
The metrics that get logged using this method are always logged to step 0, so no meaningful graph is made
* Change expected step value to None
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Co-authored-by: Jirka Borovec <6035284+Borda@users.noreply.github.com>
Co-authored-by: Luca Antiga <luca.antiga@gmail.com>