Rename `Shape` to `AvatarShape` (#3986)

This PR renames the `Shape` enum to `AvatarShape`, since it seems pretty
specific to `Avatar`s.

Release Notes:

- N/A
a579ef17d7Marshall Bowers committed on 1/9/2024, 9:21:27 PM· committed by GitHubparent7ed3f5f
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