Update Pattern Lab To "Actually" Ignore Certain Files / Folders

[sghoweri]

Short version: Pattern Lab's Pattern Data reclusively looks through every single file and directory in the _patterns folder, independent on what file types / directory names are flagged to be ignored.

Currently these ignore settings are used to omit what gets copied over to the public folder when building however as I found out firsthand, these critically aren't ignored when the files get globbed.

...This causes Pattern Lab to become COMPLETELY unusable if say, you are independently versioning your components in a monorepo via Lerna, and Pattern Lab discovers all these yummy files in the nested node_modules folders. Yes, crappy workflows involving never-ending symlinks or file copying can work, but those solutions aren't sustainable when PL is hard-wired to want your patterns to live in one and only one place.

We have a working solution that involves using Symphony Finder to exclude the paths we want PL to ignore which seems to be doing the trick. With a little refactoring to configure this to use the YAML config, this should be PR ready: https://github.com/bolt-design-system/bolt/blob/feature/v0.3.0-alpha.4/.patches/ignoreCertainFolders.patch

CC @EvanLovely @evanmwillhite @jesconstantine @aleksip @bradfrost