[3.12] gh-115961: Improve tests for compressed file-like objects (GH-115963) #116032
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file name, an open file object, a file object opened by file
descriptor, and a file-like object without name and mode attributes
(io.BytesIO)
seekable() in different modes and states
(cherry picked from commit e72576c)
Co-authored-by: Serhiy Storchaka storchaka@gmail.com