Auto merge of #77552 - ecstatic-morse:body-def-id, r=lcnr

Replace `(Body, DefId)` with `Body` where possible

Follow-up to #77430.

I `grep`-ed for parameter lists in which a `Body` appeared within a few lines of a `DefId`, so it's possible that I missed some cases, but this should be pretty complete. Most of these changes were mechanical, but there's a few places where I started calling things "caller" and "callee" when multiple `DefId`s were in-scope at once. Also, we should probably have a helper function on `Body` that returns a `LocalDefId`. I can do that in this PR or in a follow-up.

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