gh-104380: Improve csv has_header heuristics
#104385
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Improved type detection for some common types - boolean and datetime. Now
['IsOK', 'True', 'True']will vote yes tohas_headerinstead ofno.['IsOK', 'yes', 'no']will vote yes instead of ignore.sample13was a bad test - it was just to indicate a corner case not so correct behavior. The bahavior after this change actually makes more sense.