Issue #3495750 by tr: Type hint negate()

src/Core/RulesConditionBase.php

src/Core/RulesConditionInterface.php

src/Engine/ConditionExpressionContainer.php

src/Engine/ConditionExpressionInterface.php

src/Plugin/RulesExpression/ConditionExpression.php

tests/src/Kernel/Engine/MetadataAssertionTest.php