ignore a11y tests for now, re #2635

.gitlab-ci.yml

@@ -294,7 +294,7 @@ test-e2e:
     - *initialize-studip-database
     - npm ci
     - npm install playwright
-    - npx playwright install --with-deps
+    - npx playwright install --with-deps --grep-invert a11y
   script:
     - php -S $PHP_WEBSERVER_URL -t public &
     - PHP_SERVER_PID=$!