Qiskit / qiskit / 10296040200

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Fix dag visualization with Var wires (#12848) (#12923)

* Fix dag visualization with Var wires

This commit fixes the dag visualization for DAGs with classical
variables. The Var type was not handled in the attribute callback
functions for nodes and edges. This was causing the visualizer to fail
if the dag contained these types. This fixes this by adding explict
handling for the Var types and using the name attribute of the Var
object.

* Add release note and test

(cherry picked from commit adbe88707)

Co-authored-by: Matthew Treinish <mtreinish@kortar.org>

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