Fix deprecation warnings emitted by import qiskit.primitives (backport #10287)
#10290
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The primitives still need to support the legacy `qiskit.opflow.PauliSumOp` while that object is deprecated but not removed. However, we do not want the import of `qiskit.primitives` to need to import `opflow` to do that, since that will cause the deprecation warnings emitted by the import of `opflow` to be hidden (they'll be blamed on Qiskit library code, so hidden by default). All type-hint usage we can hide behind the `TYPE_CHECKING` static analysis gate. For cases where we were actively runtime type-checking an object, we can gate the `isinstance` check behind a check that `qiskit.opflow` is already imported; the object cannot be a `PauliSumOp` if the module isn't initialised. (cherry picked from commit 81964e6)
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jakelishman
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Jun 15, 2023
jakelishman
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Changelog: Bugfix
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This is an automatic backport of pull request #10287 done by Mergify.
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