Update the `TimeSeriesImputer` to return None for y when y isn't passed in
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Description
Currently if no value for `y` is passed to the `TimeSeriesImputer`, the resulting output returns a `pd.Series` object with one None value due to [this](https://github.com/alteryx/evalml/blob/main/evalml/pipelines/components/transformers/imputers/time_series_imputer.py#L167).
The behaviour should match our other components and `y` should be returned as `None` if nothing has been passed in.
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