repo: accept rspack startup output in accessibility CI

Use a generic Lighthouse server ready pattern so the accessibility job recognizes the example app startup log after the rspack switch.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

lighthouserc.js

@@ -54,7 +54,7 @@ module.exports = {
         preset: 'desktop',
       },
       startServerCommand: 'yarn start',
-      startServerReadyPattern: 'webpack compiled successfully',
+      startServerReadyPattern: 'compiled successfully',
       startServerReadyTimeout: 600000,
       numberOfRuns: 1,
       puppeteerScript: './.lighthouseci/scripts/guest-auth.js',