Qiskit / qiskit / 13836289882

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Preserve bit locations through pickle (backport #13980) (#14011)

* Preserve bit locations through pickle (#13980)

* Preserve bit locations through pickle

Previously when we were pickling a DAGCircuit the bit locations fields
were forgotten about. So when we loaded a DAGCircuit from a pickle the
bit locations were empty. This would cause any call to find_bit() to
raise an error because there was no entry for any of the bits in the
dag. This commit fixes this by reconstructing the bit locations on
__setstate__ by iterating over the dag's qubits and clbits.

Fixes #13976

* Fix clippy

* Update docstrings

* Fix name change after rebase

(cherry picked from commit 9dcc668e4)

* Fix method name for stable/2.0 vs main

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

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