[3.14] gh-136170: Revert adding `ZipFile.data_offset` (GH-136950) (#136955)

gh-136170: Revert adding `ZipFile.data_offset` (GH-136950)

* Revert "gh-84481: Make ZipFile.data_offset more robust (GH-132178)"

This reverts commit 6cd1d6c6b142697fb72f422b7b448c27ebc30534.

* Revert "gh-84481: Add ZipFile.data_offset attribute (GH-132165)"

This reverts commit 0788948dcb980c7648b29ca363390b696d7f188f.

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(cherry picked from commit 6bf1c0ab3497b1b193812654bcdfd0c11b4192d8)

Co-authored-by: Emma Smith <emma@emmatyping.dev>
Co-authored-by: Gregory P. Smith <greg@krypto.org>