backend: Handle corrupt zip files

Corrupt zip files would already make hircine throw an error, but
depending on the exact problem it would not report which file (or even
which entry in a zip file) is affected. Use ZipFile.testzip() to catch
common problems and make sure to re-raise any exception within as a
BadZipFile exception. This makes sure to also report decompression
problems that are raised as a zlib.error exception, for example.

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