[3.13] GH-120754: Add more tests around seek + readall (GH-122103) #122215
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In the process of speeding up readall, A number of related tests
(ex. large file tests in test_zipfile) found problems with the
change I was making. This adds I/O tests to specifically test these
cases to help ensure they don't regress and hopefully make debugging
easier.
This is part of the improvements from
https://github.com/python/cpython/pull/121593GH-issuecomment-2222261986
(cherry picked from commit 9eb7341)
Co-authored-by: Cody Maloney cmaloney@users.noreply.github.com