[3.11] gh-105497: [Enum] Fix Flag inversion when alias/mask members exist. (GH-105542)#105571
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When inverting a Flag member (or boundary STRICT), only consider other canonical flags; when inverting an IntFlag member (or boundary KEEP), also consider aliases.
(cherry picked from commit 59f009e)
Co-authored-by: Ethan Furman ethan@stoneleaf.us