Fix 03210_variant_with_aggregate_function_type test

[ianton-ru]

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• Build/Testing/Packaging Improvement

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Fix stability for test 03210_variant_with_aggregate_function_type

Documentation entry for user-facing changes

Test was failed if request returned rows in different order. "ORDER BY" should fix it.

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[ianton-ru]

Just small fix - arrow index starts from 1, not from 0, so value 'success' was not used before.

[ianton-ru]

Sometimes test failed with reversed rows order in responce.

[robot-clickhouse-ci-2]

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