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box: fix memory leaks on `ER_MULTISTATEMENT_TRANSACTION` in DDL

Space index build and space format checking operations don't destroy space
iterator on `txn_check_singlestatement` failure — fix this.

Closes #8773

NO_DOC=bugfix
NO_TEST=<leak happens in small, cannot be detected by sanitizer>

(cherry picked from commit 6689f5111)

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