Elmer simulations have no way of writing `*project_results.json` w/o editing `.sh`

[nikosavola]

In run.py for running Elmer simulations, there exists a --write-project-results argument that will write a capacitance matrix in JSON format equivalent to Q3D simulations. However, this argument cannot currently be added automatically to the simulation .sh files.

Suggestion

Add something along the line write_project_results to the workflow argument of export_elmer to fix this, and maybe have it as True by default.

[nikosavola]

I will do this as it is needed for relevant simulation automation