Run linters for all web app packages as part of Web App CI linting (#22576)

.github/workflows/channels-ci.yml

@@ -38,7 +38,6 @@ jobs:
           make node_modules
           # make channels/e2e/playwright/node_modules
       - name: ci/lint
-        working-directory: webapp/channels
         run: |
           npm run check
   check-i18n: