Update from_into exercise to use error handling instead of default value #2297
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…lues - Replace From<&str> trait with TryFrom<&str> for proper error handling - Add ParsePersonError enum with BadLen, NoName, and ParseInt variants - Update all tests to expect appropriate errors instead of default Person values - Maintain same error handling pattern as from_str exercise - Add required imports for TryFrom and TryInto traits
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closes #2225