Run extract-errors script in CI

The lint_build job already checks for unminified errors, but the output
isn't super helpful.

Instead I've added a new job that runs the extract-errors script and
fails the build if `codes.json` changes. It also outputs the expected
diff so you can easily see which messages were missing from the map.

.circleci/config.yml

@@ -209,7 +209,20 @@ jobs:
       - run: yarn workspaces info | head -n -1 > workspace_info.txt
       - *restore_node_modules
       - run: yarn lint-build
-      - run: scripts/circleci/check_minified_errors.sh
+
+  check_error_codes:
+    docker: *docker
+    environment: *environment
+    steps:
+      - checkout
+      - attach_workspace: *attach_workspace
+      - run: yarn workspaces info | head -n -1 > workspace_info.txt
+      - *restore_node_modules
+      - run:
+          name: Search build artifacts for unminified errors
+          command: |
+            yarn extract-errors2
+            git diff || (echo "Found unminified errors. Either update the error codes map or disable error minification for the affected build, if appropriate." && false)
 
   yarn_test:
     docker: *docker
@@ -414,6 +427,9 @@ workflows:
       - yarn_lint_build:
           requires:
             - yarn_build_combined
+      - check_error_codes:
+          requires:
+            - yarn_build_combined
       - RELEASE_CHANNEL_stable_yarn_test_dom_fixtures:
           requires:
             - yarn_build_combined