legacy: lingering PEP 527 changes #13881
Merged
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PEP 527 has been fully implemented as of #6792, meaning that these parts of the file upload logic have been effectively unreachable for a long time (both the form and distribution filename validation prevent any non-PEP 527 filenames/files from reaching this function).
As such, this should (🤞) be just a straightforward deletion. If additional tests are desired, I can add some positive tests that assert that form and filename validation are always performed ahead of this function.