A11y - Add Pa11y CI in main pipeline to collect a11y issues (#37741)

Co-authored-by: 
Hugo Häggmark <hugo.haggmark@gmail.com>
thisisobate <obasiuche62@gmail.com>

package.json

@@ -13,6 +13,7 @@
     "e2e:debug": "./e2e/start-and-run-suite debug",
     "e2e:dev": "./e2e/start-and-run-suite dev",
     "test": "jest --notify --watch",
+    "test:accessibility": "pa11y-ci --config .pa11yci.conf.js",
     "lint": "yarn run lint:ts && yarn run lint:sass",
     "lint:ts": "eslint . --ext .js,.tsx,.ts --cache",
     "lint:sass": "yarn run sass-lint -c public/sass/.sass-lint.yml 'public/sass/**/*.scss, packages/**/*.scss' -v -i '**/node_modules/**/*.scss'",
@@ -188,6 +189,7 @@
     "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",