Check that worker timeouts are actually working as planned

[josephjclark]

Taylor reports that the run timeout used by the worker is differnet to the value set from the env

We should check:

• That the default timeout is what is pased in to start.ts
• That a run can override this default timeout and set whatever it likes

A couple tight of integration tests would be really good proof of the current behavior

[josephjclark]

Red herring