BUG: fix incorrect bytes to stringdtype coercion #28282
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Backport of #28276.
Fixes #28269.
It turns out
test_scalars_string_conversionwas testing the old buggy conversion 馃檭.Is it maybe problematic to assume the bytes are UTF-8? Before we were doing something completely nonsensical so we're free to make a choice here. I think the built-in NumPy bytes dtype assumes everything is ASCII, which is maybe less useful than letting people pass in arbitrary UTF-8?
We could also probably do this faster without going through the Python C API but that can be a future pass if anyone notices.