Add slow_test as it's no longer part of Qiskit 1.0 (backport #1325)

[mergify[bot]]

This is an automatic backport of pull request #1325 done by Mergify.

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[coveralls]

Pull Request Test Coverage Report for Build 7745337433

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.01%) to 86.791%

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Files with Coverage Reduction	New Missed Lines	%
qiskit_nature/second_q/drivers/psi4d/psi4driver.py	1	85.12%
<!--	Total:	1		-->

Totals
Change from base Build 7743690493:	-0.01%
Covered Lines:	8785
Relevant Lines:	10122

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💛 - Coveralls