Create integration tests of sfg to architecture and seperate unit tests into folder

We should seperate our tests into:

tests/
    conftest.py
    unit/
    integration/

and add a couple of integration tests, for going from SFG to Architecture with different scheduling settings and checking that results are good.

The CI should also run these seperately with units first etc...

In the future more integration tests can be added for codegen etc...

added CI Testing labels

assigned to @simbj106

changed the description

mentioned in merge request !474 (merged)

closed with merge request !474 (merged)