Fix flakiness in pulse-optimal UnitarySynthesis test (backport #11307)
#11309
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The previous iteration of this test asserted that the `sx` count for non-optimal synthesis was higher than a certain particular value. This value did not have any fundamental properties, it was just the value that happened to be returned for some time. Recent OpenBLAS support for x86_64 instructions from the AVX512 SkylakeX set meant that supporting processors can now return slightly fewer `sx` gates in the non-optimal path, despite the pulse-optimal synthesis still not being in use. This caused flaky CI, when we were allocated an Azure VM that had access to the new instructions. (cherry picked from commit c7ecb5f)
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Nov 23, 2023
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This is an automatic backport of pull request #11307 done by Mergify.
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