Qiskit / qiskit-terra / 5279876251

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Fix deprecation warnings emitted by `import qiskit.primitives` (#10287)

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.

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