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Fail gracefully on bad `SabreDAG` construction (#10724) (#10769)

* Fail gracefully on bad `SabreDAG` construction

This is a private, internal Rust type, but it doesn't cost us anything
(meaningful) to bounds-check the accessors and ensure we fail gracefully
rather than panicking if we ever make a mistake in Python space. This
more faithfully fulfills the return value of `SabreDAG::new`, which
previously was an effectively infallible `Result`.

* Run `cargo fmt`

(cherry picked from commit 1606ca354)

Co-authored-by: Jake Lishman <jake@binhbar.com>

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