Python downloads do not retry on stream errors

[zanieb]

e.g.

----- stderr -----
error: Failed to install cpython-3.13.3-linux-x86_64-gnu
  Caused by: Failed to download https://github.com/astral-sh/python-build-standalone/releases/download/20250409/cpython-3.13.3%2B20250409-x86_64-unknown-linux-gnu-install_only_stripped.tar.gz
  Caused by: Request failed after 1 retries
  Caused by: error sending request for url (https://github.com/astral-sh/python-build-standalone/releases/download/20250409/cpython-3.13.3%2B20250409-x86_64-unknown-linux-gnu-install_only_stripped.tar.gz)
  Caused by: client error (SendRequest)
  Caused by: http2 error
  Caused by: stream error received: refused stream before processing any application logic

error: Failed to install cpython-3.11.11-linux-x86_64-gnu
  Caused by: Failed to extract archive: cpython-3.11.11-20250317-x86_64-unknown-linux-gnu-install_only_stripped.tar.gz
  Caused by: Invalid gzip header

Did this regress in #12175? I know the download was tweaked.

[zanieb]

cc @konstin and @Gankra can ya'll look into this?

[konstin]

I can't reproduce this locally but #13260 handles the only thing that changed for the existing downloads.

[jtfmumm]

Another case: https://github.com/astral-sh/uv/actions/runs/15637900583/job/44057783424?pr=14029

[konstin]

For context, the problem is that we can't retry once a stream is started, we need to wrap the entire streaming logic into a loop to make this work. I.e., not just the request as we do now as the request gets turned into a stream, as the stream is a lower level object that doesn't have middleware and such anymore.

[charliermarsh]

I am hoping this is fixed with the changes to remove transparent IO errors.