Cloudworks - add a "run as" option

As an integration admin, i need to be able to optionnally choose under which user id a process or integration would run with cloudworks.

This is necessary as for instance we want an integration admin to set up scheduled process using a system account with a determined access rights perimeter with the help of dca.

Additionnally there is a risk currently that if an integration admin changes its access to the target models, it will result in cloudworks not running properly anymore.