test: sql(..., strip_metadata=True) usability parameter

Summary

• test: sql(..., strip_metadata=True) usability parameter

If it's set only the "rows" part of the response is returned. This parameter is True by default because in most cases this is what we want.

• test: cleanup: sudo_sql(...) -> sql(..., sudo=True)

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• Cherry-pick to: none
• Docs follow-up: not necessary

requested review from @d.rodionov

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• cdac30a4 - test: sql(..., strip_metadata=True) usability parameter

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approved this merge request

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• da9b8865 - test: reduce test_ddl_drop_table_partial_failure flakiness
• 131dd9d5 - test: use more sql in test_ddl_drop_table_partial_failure

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merged