Log when starting to add files to python.org

[hugovk]

During the release, we get:

...
✅  Push new tags and branches to upstream
Deleted branch branch-3.14.0a6 (was 77b2c933cab).
✅  Removing temporary release branch
Waiting for browser interaction...

The browser then opens with a Sigstore page. I authorise Sigstore, then it says the page can be closed. I close it and go back to the terminal.

It then sits at "Waiting for browser interaction..." for a while, which is a bit confusing as we've just done that. It seems like it's hung, but it's not, as eventually it shows:

✅  Push new tags and branches to upstream
Deleted branch branch-3.14.0a6 (was 77b2c933cab).
✅  Removing temporary release branch
Waiting for browser interaction...
-- Command output --
Using ephemeral certificate:
-----BEGIN CERTIFICATE-----
MIICzzCCAlSgAwIBAgIUEwYStfT1rq5xVQepvaGvrMg8sy4wCgYIKoZIzj0EAwMw
NzEVMBMGA1UEChMMc2lnc3RvcmUuZGV2MR4wHAYDVQQDExVzaWdzdG9yZS1pbnRl
...
[then a lot more stuff]
...
Done - 9 files added

-- End of command output --
✅  Add files to python.org download page

Which is the result of adding the files to python.org.

Because we don't get realtime prints, let's add an extra print to show it has begun.