ci: Improve CI performance (no-changelog) (#7637)

1. Split backend and frontend tests to avoid them running in parallel
2. Enable coverage only on `master`

packages/editor-ui/package.json

@@ -22,7 +22,7 @@
     "lintfix": "eslint src --ext .js,.ts,.vue --fix",
     "format": "prettier --write . --ignore-path ../../.prettierignore",
     "serve": "cross-env VUE_APP_URL_BASE_API=http://localhost:5678/ vite --host 0.0.0.0 --port 8080 dev",
-    "test": "vitest run --coverage",
+    "test": "vitest run",
     "test:dev": "vitest"
   },
   "dependencies": {