Qiskit / qiskit / 7749518963
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Remove provider-specific fake backends,`FakeProvider` class and related tools in 1.0 (#11376)

* Remove provider-specific fake backends, fake provider and related tools

* Add release note

* Remove sneaky fake generic

* Fix lint

* Fix typo, manifest and attempt to fix visual tests

* Fix seed in visual tests, change imports

* Remove deleted files and remove FakeBackend mentions from examples in API docs

* I'm sorry I'm at the point where I confuse 1s and 5s.

* Fix skip message when aer isn't installed

* Skip fake backend test with aer on windows

* Revert windows skip and limit v2 backend size

The underlying cause of the windows failures were actually much larger
performance issues in aer's `NoiseModel.from_backend()` constructor
method when run with a BackendV2 instance. This is causing the
`NoiseModel` construction for `GenericBackendV2` to take a great deal of
time and use up all the memory we have available in the windows VMs in
CI. To avoid this issue in the short term until a fix can be added to
aer this commit just limits the size of the backend v2 examples we run
to prevent resources problems in CI.

* Avoid all to all connectivity in fake backend tests

The aer noise model construction was an artifact of using all to all
connectivity in the test. Using a more sparse connectivity alleviates
the performance issues. This commit switches to use a ring graph and
restores the larger qubit count backends.

---------

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

58802 of 65937 relevant lines covered (89.18%)

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