DBT inside "meltano elt" inside Airflow inside "meltano invoke airflow" can fail because it inherits Meltano venv through `PYTHONPATH`
Addressing #2060 (closed) would fix this too, since we would no longer be injecting the Meltano venv into Airflow's venv through the PYTHONPATH
variable. For the moment, we can work around it by resetting PYTHONPATH
.