[3.13] gh-125710: [Enum] fix hashable<->nonhashable comparisons for member values (GH-125735) (GH-125851)

gh-125710: [Enum] fix hashable<->nonhashable comparisons for member values (GH-125735)
(cherry picked from commit aaed91cabcedc16c089c4b1c9abb1114659a83d3)

Co-authored-by: Ethan Furman <ethan@stoneleaf.us>