Enhance save game codec tests for compatibility and add DOS-style file writing test
- Updated assertions in existing tests to allow for multiple valid values for `slot` and `createdAtMs` to accommodate legacy data. - Added a new test to verify that the CompatibleSaveGameCodec correctly writes DOS-style description-prefixed files, ensuring proper encoding and structure. Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>
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