chore(ci): Fix linting job in CircleCI

The command being run by Circle CI would not return an error code if the linting failed
on the JS step, because it only looked at the exit code of linting the TS files.

Author: mt-pcuba

.circleci/config.yml

@@ -37,7 +37,10 @@ jobs:
       - *attach_workspace
       - run:
           name: Linting JavaScript
-          command: yarn lint
+          command: yarn lint:js
+      - run:
+          name: Linting TypeScript
+          command: yarn lint:ts
 
   unit_test:
     <<: *docker_defaults