fix JSON_ARRAYAGG not to over-quote json in joins
This replaces 8711adb7 if a temptable field is created for some json expression (is_json_type() returns true), make this temptable field a proper json field. A field is a json field (see Item_field::is_json_type()) if it has a CHECK constraint of JSON_VALID(field). Note that it will never be actually checked for temptable fields, so it won't cause a run-time slowdown.
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