[3.12] gh-112414: Add additional unit tests for calling `repr()` on a namespace package (GH-112475) (#112480)

gh-112414: Add additional unit tests for calling `repr()` on a namespace package (GH-112475)
(cherry picked from commit cf2054059c08ef1c5546f24874191f341dc94eb9)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
Co-authored-by: Eric Snow <ericsnowcurrently@gmail.com>