workflows/eval: split tag into compare and reviews jobs

Splitting the job up into two is required to then move the reviews job
to a separate, re-usable workflow in the next step.

To avoid the eval workflow from taking more time to finish, after having
it optimized carefully recently, the reviews job starts in parallel to
the compare job, even though it requires the comparison results to
finish. We can then use the time to already set up nix, build
requestReviews and fetch our app-token.

This might seem overly complex, but given that we need to do the same
dance in the next commit when we run the re-usable workflow separately,
it's actually just easier to review that way, not more.

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