BUG: Series.tolist to return None in place of pd.NA

[lukemanley]

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As discussed here: #29738 (comment)

Offering this up as a potential solution to make Series.tolist return None (python native types) in place of pd.NA. This would make Series.tolist consistent with Series.to_dict which at the moment differ:

In [1]: import pandas as pd

In [2]: ser = pd.Series([1, pd.NA], dtype="Int64")

In [3]: ser.to_dict()
Out[3]: {0: 1, 1: None}

In [4]: ser.tolist()
Out[4]: [1, <NA>]

I don't think this fully closes #29738 as there may still be an open question about __iter__.

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