Restrict hello_quantum ibmq example script to backends with at least two qubits #4511
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Summary
The hello_quantum example was repeatedly failing because it usually selected the 1-qubit Armonk provider, but it needs two qubits to run.
Details and comments
I've added a filter to ensure that only usable providers are selected.
There are no automated tests for this example, but it now runs on my machine. (I know, I know...)
Fixes #4510