Improve error message on bad OpenQASM 3 basis_gates
argument (backport #12945)
#12946
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Summary
If the user requests a basis-gate name that cannot be used (like a keyword), there is nothing sensible we can output for a circuit that contains one of those operations. The exporter was already correctly erroring in these cases, but the error message was quite opaque.
Details and comments
Fix #12886
This is an automatic backport of pull request #12945 done by [Mergify](https://mergify.com).