Fix spelling of method IterableQueryResult.isLife

IterableQueryResult.isLife is misspelled. The intent was to call it "isLive".

Its only actual use is to check for non-closed connections so that a warning can be emitted when they are finally closed automatically (per NXP-14185 (fix query results leaks)), which is only relevant for VCS whose query result implementation holds a ResultSet.

We'll deprecate it and replace its use with a method mustBeClosed, which can be left to always return false on DBS.