fix: better collision error message (copy/pastable filenames)

[TyberiusPrime]

Tiny quality of life improvement. Had a package where there where 8 init.py files colliding, and this way you can copy/paste the filenames for a quick md5sum.

Now looks like

       > __main__.FileCollisionError: Two or more packages are trying to provide the same file with different contents
       >
       >         Files: /nix/store/6qcjwvh8kx5bc10sbqkvsndjlqi3j2sw-azureml-core-1.57.0.post3/lib/python3.9/site-packages/azureml/__init__.py /nix/store/3dk98flclhm6fhpvz31bpsqrc4is7shz-azureml-train-automl-client-1.57.0/lib/python3.9/site-packages/azureml/__init__.py /nix/store/vvv01nh1v1s93z596pdwfhwsx7s1khrv-azureml-train-core-1.57.0/lib/python3.9/site-packages/azureml/__init__.py /nix/store/pnf0vb2a2gdsplsn77l8agqzz6mbki47-azureml-pipeline-core-1.57.0/lib/python3.9/site-packages/azureml/__init__.py /nix/store/46qn2zzp4crx0vk9plhz7r1sf0lrwg0l-azureml-pipeline-steps-1.57.0/lib/python3.9/site-packages/azureml/__init__.py /nix/store/nkvfibwdm3jdbm3f5gd4wgjplsn3d2qi-azureml-automl-core-1.57.0/lib/python3.9/site-packages/azureml/__init__.py /nix/store/mp1sxs07hr2i7knxc80lab5v4hka72wa-azureml-telemetry-1.57.0/lib/python3.9/site-packages/azureml/__init__.py /nix/store/4v6cjl5a32s5v8gcw50cwmsm7arwgx60-azureml-train-restclients-hyperdrive-1.57.0/lib/python3.9/site-packages/azureml/__init__.py

used to look like

> __main__.FileCollisionError: Two or more packages are trying to provide the same file with different contents
       >
       >         Files: [PosixPath('/nix/store/6qcjwvh8kx5bc10sbqkvsndjlqi3j2sw-azureml-core-1.57.0.post3/lib/python3.9/site-packages/azureml/__init__.py'), PosixPath('/nix/store/3dk98flclhm6fhpvz31bpsqrc4is7shz-azureml-train-automl-client-1.57.0/lib/python3.9/site-packages/azureml/__init__.py'), PosixPath('/nix/store/vvv01nh1v1s93z596pdwfhwsx7s1khrv-azureml-train-core-1.57.0/lib/python3.9/site-packages/azureml/__init__.py'), PosixPath('/nix/store/pnf0vb2a2gdsplsn77l8agqzz6mbki47-azureml-pipeline-core-1.57.0/lib/python3.9/site-packages/azureml/__init__.py'), PosixPath('/nix/store/46qn2zzp4crx0vk9plhz7r1sf0lrwg0l-azureml-pipeline-steps-1.57.0/lib/python3.9/site-packages/azureml/__init__.py'), PosixPath('/nix/store/nkvfibwdm3jdbm3f5gd4wgjplsn3d2qi-azureml-automl-core-1.57.0/lib/python3.9/site-packages/azureml/__init__.py'), PosixPath('/nix/store/mp1sxs07hr2i7knxc80lab5v4hka72wa-azureml-telemetry-1.57.0/lib/python3.9/site-packages/azureml/__init__.py'), PosixPath('/nix/store/4v6cjl5a32s5v8gcw50cwmsm7arwgx60-azureml-train-restclients-hyperdrive-1.57.0/lib/python3.9/site-packages/azureml/__init__.py')