[actions] add finisher

Author: ljharb

.github/workflows/test.yml

@@ -44,3 +44,11 @@ jobs:
           use-npm-ci: true
       - name: Run diff check for the breakUpAriaJSON script
         run: node scripts/buildModelModules.js && git diff --exit-code -- src
+
+  finisher:
+    name: all checks
+    needs: [tests, flow, eslint, diff-breakUpAriaJSON]
+    runs-on: ubuntu-latest
+    steps:
+      - run: true
+