Refactor: move tests cases to pytest in SQLAlchemy test suite [ver#6]

[TomeHirata]

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Related Issues/PRs

#xxx

#10266

What changes are proposed in this pull request?

This is the 6th PR of #10042, which tries to refactor https://github.com/mlflow/mlflow/blob/master/tests/store/tracking/test_sqlalchemy_store.py into the pytest style

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• Existing unit/integration tests
• New unit/integration tests
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[harupy]

LGTM!