[core-workflow] Migration PEP started

[Brett Cannon]

I'm developing it at
https://github.com/brettcannon/github-transition-pep/blob/master/pep-NNNN.rst .
I'm not posting it here as I'm still actively writing it. The only reason
I'm mentioning it now is because the migration plan has been very roughly
outlined, so if it  looks like I'm missing something, please let me know.
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