Add a unit test of qubit-wise grouping of SparsePauliOp

[t-imamichi]

Summary

The unit test test_group_commuting of SparsePauliOp does not check SparsePauliOp.group_commuting(qubit_wise=True)
https://github.com/Qiskit/qiskit-terra/blob/df2ddcadf3c6d59b8bab8b0b1ceff14234fa82b5/test/python/quantum_info/operators/symplectic/test_sparse_pauli_op.py#L947-L947

On the other hand, the unit tests of PauliList cover grouping of qubit-wise commuting.
https://github.com/Qiskit/qiskit-terra/blob/966aab1bb624cb45f8de77d305f5407d94dbd82d/test/python/quantum_info/operators/symplectic/test_pauli_list.py#L2096

This PR adds a unit test of SparsePauliOp.group_commuting(qubit_wise=True).

Details and comments

[qiskit-bot]

One or more of the the following people are requested to review this:

• @Qiskit/terra-core
• @ikkoham

[coveralls]

Pull Request Test Coverage Report for Build 5816819492

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 22 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.02%) to 87.238%

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Files with Coverage Reduction	New Missed Lines	%
crates/qasm2/src/lex.rs	4	90.38%
crates/qasm2/src/parse.rs	18	96.67%

Totals
Change from base Build 5812842422:	-0.02%
Covered Lines:	74243
Relevant Lines:	85104

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💛 - Coveralls

[ikkoham]

Thanks. Nice catch.