Check 2x2 unitary in has_stabilizer_effect #2938
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If everything else fails (i.e. op and its gate don't declare has_stabilizer effect), and op has unitary, 2hich is 2x2 unitary, explicilty check if that unitary has stabilizer effect.
After this change has_stabilizer_effect returns True exactly for those gates which are supported by CliffordSimulator.
This is follow-up to PR #2803.
This is copy of PR #2885 which ended up in urepairable state because of CLA.