[RuboCop] Disallow logging in tests

Don't want these committed

.rubocop.yml

@@ -87,6 +87,8 @@ Rails/Output:
   Exclude:
     - db/seeds.rb
     - db/fixes/*.rb
+  Include:
+    - test/**/*.rb
 
 Rails/ReversibleMigration:
   Enabled: false

test/helpers/link_helper_test.rb

@@ -36,7 +36,6 @@ class LinkHelperTest < ActionView::TestCase
   end
 
   test "it returns a fontawesome icon if no hostname is found" do
-    pp favicon_for_link("https://example.com")
     assert_match("globe", favicon_for_link("https://example.com"))
   end