bring back the percy finalize task

now done using a CircleCI "orb".

While the percy snapshot test still fails
(fixing this will requires "approval" on percy.io),
the percy snapshots now get properly
uploaded to percy.io, making them available for viewing.

Author: etpinard

.circleci/config.yml

@@ -1,6 +1,7 @@
 version: 2.1
 
 orbs:
+  percy: percy/[email protected]
   browser-tools: circleci/[email protected]
 
 jobs:
@@ -54,12 +55,11 @@ jobs:
       - store_artifacts:
           path: /tmp/dash_artifacts
 
-      - run:
-          name: 🦔 percy finalize
-          command: npx percy finalize --all
-
 workflows:
   version: 2
   build:
     jobs:
       - test
+      - percy/finalize_all:
+          requires:
+            - test