shutil.unpack_archive returns bogus ReadError exceptions when input is not found or inaccessible

Bug report

$ python -c 'import shutil; shutil.unpack_archive("./enoent")'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib64/python3.11/shutil.py", line 1311, in unpack_archive
    raise ReadError("Unknown archive format '{0}'".format(filename))
shutil.ReadError: Unknown archive format './enoent'

$ python -c 'import shutil; shutil.unpack_archive("/root/inaccessible")'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib64/python3.11/shutil.py", line 1311, in unpack_archive
    raise ReadError("Unknown archive format '{0}'".format(filename))
shutil.ReadError: Unknown archive format '/root/inaccessible'

The generic exception makes it handle to handle the error programatically, and the message is also very confusing to the user. Instead, the function should just propagate the detailed exception it got internally. Compare with open:

$ python -c 'open("./enoent")'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
FileNotFoundError: [Errno 2] No such file or directory: './enoent'

$ python -c 'open("/root/inaccessible")' 
Traceback (most recent call last):
  File "<string>", line 1, in <module>
PermissionError: [Errno 13] Permission denied: '/root/inaccessible'

Your environment

python3-3.11.0-1.fc37.x86_64

Linked PRs

• gh-155587

Empieza en shutil.py alrededor de la línea 1311 y reproduce los comandos para archivos faltantes y rutas inaccesibles que se muestran en el informe. Comprueba el comportamiento existente de unpack_archive y las pruebas relacionadas, si las hay; se considera terminado cuando estas entradas exponen sus excepciones detalladas del sistema de archivos en lugar de un ReadError genérico.