[llvm] [CI] Make email check workflow fail when author's email is private in Github UI (PR #148694)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 commented:

> Workflow run after I changed my default public email: https://github.com/llvm/llvm-project/actions/runs/16300461944/job/46033416527?pr=148694#step:3:24 (compare it with the previous run https://github.com/llvm/llvm-project/actions/runs/16279496749/job/45966062207)
Changing my default public email also changes the email returned by GraphQL.

> Regarding official documentation, the closest one I found is: https://docs.github.com/en/graphql/reference/objects#user
user.email returns the user's publicly visible profile email.

That looks good to me. I can't imagine anything other than the default email would be used when merging a PR for someone.

https://github.com/llvm/llvm-project/pull/148694