Qiskit / qiskit / 7732722741
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Poison import if Qiskit 1.0+ is detected (#11617)

* Poison import if Qiskit 1.0+ is detected

This uses `importlib.metadata` to search for installations of Qiskit 1.0
at runtime, and poison the import if one is detected.  The two packages
are incompatible in a way that we cannot express to `pip` without having
poisoned the `qiskit-terra` package as a whole, which is something we're
less willing to do in order to keep it easier to install old versions
of Qiskit-dependent software, and to keep the Qiskit 1.0 packaging story
clean for the coming years.

It is not generally expected that a user specifically attempting to
install Qiskit 0.45/0.46 will accidentally install Qiskit 1.0 as well.
The intention of this poisoning in the "stable" branch is so that the
case that a user installs Qiskit 1.0, but either also includes an old
package with a dependency purely on `qiskit-terra`, or runs a subsequent
`pip install` command whose version resolution causes `qiskit-terra` to
become installed.  In both these cases, it could be the case that the
`import qiskit` command finds the `qiskit-terra` `__init__.py` file,
and so any error we also place in Qiskit 1.0 would have been skipped.

* Hide inner variable from init

* Add shortlink to migration guide

* Improve release note

* Use specific version ranges

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

---------

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

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