Improve error reporting while uploading a document

[adaussy]

In some case, the imported file is to big to be parsed with the current implementation of the parser.

Causing an error in the node process responsible for provinging the AST:

2026-03-06T17:06:09.596+01:00 ERROR 37344 --- [45-31656574fee3] org.eclipse.syson.sysml.SysmlToAst       : Parsing errors C:\Users\arthu\AppData\Local\Temp\syside-cli1170414543181145943.js:85215
      return JSON.stringify(node, JSONreplacer, indent);
                  ^

RangeError: Invalid string length
    at JSON.stringify (<anonymous>)
    at stringify2 (C:\Users\arthu\AppData\Local\Temp\syside-cli1170414543181145943.js:85215:19)
    at C:\Users\arthu\AppData\Local\Temp\syside-cli1170414543181145943.js:114617:58
    at Generator.next (<anonymous>)
    at fulfilled (C:\Users\arthu\AppData\Local\Temp\syside-cli1170414543181145943.js:40:24)
    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)

Node.js v22.16.0

This issues aims to provide feedback to the user so he is aware of the problem an can workaround it by splitting the document.

[adaussy]

Due to a API limitation of Sirius web see 6281 we need to create a empty Resource to be able to report an error. This is not really user friendly but at least an error is reported.