v.25.9Bug Fix (user-visible misbehavior in an official stable release)

Fix possible wrong result of non-correlated EXISTS

Official CH changelog text
Fix possible wrong result of non-correlated EXISTS. It was broken with execute_exists_as_scalar_subquery=1 which was introduced in https://github.com/ClickHouse/ClickHouse/pull/85481 and affects 25.8. Fixes #86415. #87207 (Nikolai Kochetov).
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