Fix StatevectorSampler to raise an error if a circuit with c_if is passed (backport #12842)

[mergify]

Summary

StatevectorSampler cannot handle both control flow and c_if because Statevector cannot.
But, it ignores c_if by mistake. This PR makes StatevectorSampler raise an error if a circuit with c_if is passed.
A unit test of StatevectorSampler used c_if accidentally. So, this PR also fixes the case without passing c_if to StatevectorSampler.

Fixed #12281

Details and comments

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This is an automatic backport of pull request #12842 done by [Mergify](https://mergify.com).

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[coveralls]

Pull Request Test Coverage Report for Build 10161716860

Details

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• 9 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.008%) to 89.972%

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Files with Coverage Reduction	New Missed Lines	%
crates/qasm2/src/lex.rs	3	93.13%
crates/qasm2/src/parse.rs	6	97.61%

Totals
Change from base Build 10151658550:	0.008%
Covered Lines:	66350
Relevant Lines:	73745

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💛 - Coveralls