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Make circuit drawers *not crash* on `Expr` nodes (#10504) (#10520)

* Make circuit drawers *not crash* on `Expr` nodes

This at least causes the circuit visualisers to not crash when
encountering an `Expr` node, and instead emit a warning and make a
best-effort attempt (except for LaTeX) to output _something_.  We intend
to extend the capabilities of these drawers in the future.

* Soften warnings about unsupported `Expr` nodes

(cherry picked from commit c8552f6b5)

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

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