Occasional syntax errors in the temp sh file

Sometime `__esy-bash__824592099__1__` file has syntax errors like these

```
mount -c /cygdrive -o binary,noacl,posix=0,user;
cd "C:/Users/user/b-runner/gl/builds/0/xxxxxxxx/ligolang/ligo/_esy/default/store/b/opam__s__tezos_base-842c849a";
"C:/Users/user/AppData/Roaming/npm/node_modules/esy/node_modules/esy-bash/.cygwin/bin/rm.exe" "-rf" "vendors";s";
```

This is likely happening because the random number collisions in the filename, causing file overwrites. A good solution could be clearing these files after use. They end up getting accumulated in the current state of things.

Start by locating where __esy-bash__ temporary files are generated and cleaned up, then reproduce the filename-collision case in the Cygwin environment described. Done means temporary files cannot overwrite one another and are removed after use; check for existing tests covering temporary shell-file handling and extend them if present.

Written by the indexing model from the issue text.