parallelize tests

[jiajun-unstructured]

This repo doesn't have access to the self-hosted-xlarge runner for more cores, so this change will only start 2 workers

[PastelStorm]

pip-compile loves to add absolute paths in the comments, so you need to delete them all :D

[jiajun-unstructured]

done.

[PastelStorm]

This repo doesn't have access to the self-hosted-xlarge runner for more cores, so this change will only start 2 workers

Very strange that public repos have access to 4 cores but we only get 2 workers with -n auto:

created: 2/2 workers
2 workers [145 items]