Add return type annotation to FixtureRequest.node

[Thibault-dlr]

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[RonnyPfannschmidt]

🤖 Written by Claude Opus 5.5 via Claude Code for the pytest maintainers; I prompted it, it did the work, I read it.

Thanks for the PR, but I'm closing it. request.node is left untyped on purpose. See bluetech's reasoning in #13888 (comment): a declared Node (or Item | Collector) return type would force users to assert isinstance(...) or cast whenever they know the concrete type, which is the common case.

With this change, mypy --strict on user code like request.node.callspec, request.node.function or request.node.rep_call (the documented pattern for making test reports available in fixtures) fails with "Node" has no attribute .... All of those pass on main.

It also duplicates the earlier #15103, which proposes the same change.

A follow-up PR will add a comment in the source that explains this, so the question doesn't keep coming back.

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