[core-workflow] Migration is done!

[Brett Cannon]

A massive thank you to everyone who helped with this. It has been a long
road but we finally reached the end of it!

As for what's next, I think getting Misc/NEWS straightened out and then
getting cherry-picking PRs automated are the next important items. As
always https://github.com/python/core-workflow/issues has the current ideas
on how to improve our workflow.
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