[roll] Roll fuchsia [check-licenses] Adding 'license' package

This is all v2 work, which still isn't live yet.

Copied the notice file traversal logic from v1, put them all in the same
area -> the notice subpackage.

This also uses the word "pattern" instead of "license" when talking
about the regex patterns. Now, "license" only means actual license texts
in the fuchsia tree.

Also also removes the "licenses" struct, which will hopefully make the
check-licenses directory / structure easier to follow.

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/655385
Original-Revision: 78189dc5b8d2d58d171f4e0ff0a532b14366f2bb
GitOrigin-RevId: 583cb3e3376c70bfbc7c84e69c20238990acaf53
Change-Id: Ifb81c4e6b78b10a197f701c5aff771ff3c7ec9fb
diff --git a/stem b/stem
index 8cf2884..4ac5bb5 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="69d7edc344a0a6b58ec5ce24396fccb0cb3312ea"/>
+             revision="78189dc5b8d2d58d171f4e0ff0a532b14366f2bb"/>
   </projects>
   <hooks>
     <hook name="install-environment"