Pipeline: Fix pa11y ci when server is not available and fix publish frontend metrics step (#38485)

package.json

@@ -185,11 +185,11 @@
     "ngtemplate-loader": "2.0.1",
     "nodemon": "2.0.2",
     "optimize-css-assets-webpack-plugin": "5.0.5",
+    "pa11y-ci": "2.4.2",
     "postcss-browser-reporter": "0.6.0",
     "postcss-loader": "3.0.0",
     "postcss-reporter": "6.0.1",
     "prettier": "2.2.1",
-    "pa11y-ci": "2.4.2",
     "raw-loader": "4.0.2",
     "react-hot-loader": "4.8.0",
     "react-select-event": "^5.1.0",
@@ -209,6 +209,7 @@
     "ts-node": "9.0.0",
     "tslib": "2.2.0",
     "typescript": "4.3.4",
+    "wait-on": "6.0.0",
     "webpack": "4.41.5",
     "webpack-bundle-analyzer": "3.6.0",
     "webpack-cleanup-plugin": "0.5.1",