[#12113] type annotation updates

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• email.message.Message is more accurate now about get_payload's union
• globaltrace attribute is now exposed

Scope and purpose

Fixes #12113

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please review

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@itamarst in particular

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hell yeah, CI passed on the first try

[adiroiban]

Looks good. Thanks for fixing trunk.

Thanks for the separate ticket.

I have updated the title of the PR to include the link to ticket number.

The macos tests might have passed now, but in the past they were failing quite often on first times, and sometimes even on second try :(
I still don't know how to fix them.

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The macos tests might have passed now, but in the past they were failing quite often on first times, and sometimes even on second try :(
I still don't know how to fix them.

Yeah I really don't know what's going on there. I no longer know what the bug is in the reactor itself, which seems like it should work to me now. And I never see these failures locally. I really wonder if it's something that github has done to their builders.