cancelling JSON import in the middle gives an error

[NicolasAnquetil]

• Start an import of a mooseModel from a file (eg. a Java model from a JSON file)
• interrupt it in the middle by clicking on the red button in the progrtess bar
• gives some error (depending on where it was in the import)

The interruption should be catched

[Gabriel-Darbord]

I tried it but it does not actually throw an error, it opens a debugger on the halted process.
This could arguably be useful, but I guess the expected behavior is that the process should stop quietly (maybe with a toast saying it was interrupted).

[Gabriel-Darbord]

Actually more complicated than anticipated because no exception is thrown and the behavior is hard-coded in the Job class.
This issue depends on pharo-project/pharo#17471 (unless we want to go at it another way).