[BUG] Internal Server Error when uploading JSON File via /upload

[FriedJannik]

Describe the bug
When uploading a File via /upload and the Part of the Multipart Form Data is appplicaiton/octet-stream the AAS Env defaults to AASX which leads to an 500 Internal Server Error: java.util.zip.ZipException: Cannot find zip signature within the first 4096 bytes

A more meaningful error message should be thrown