poly info: exclude cache files from list of bricks

[DavidVujic]

Describe the bug
Accidentally listing a __pycache__ folder among bricks, when running the poetry poly info command.

To Reproduce
Steps to reproduce the behavior:

1. put a __pycache__ folder in components/<my-top-namespace> folder
2. run poetry poly info

Expected behavior
The command should not list cache files or folders.

Screenshots