Central Notice selenium tests don't run on each push like most other extensions, it runs only daily against betacluster.

Because betacluster has persistant data, it retains the central notice banner . Since catalyst is a fresh env each time, it requires a seed to run the tests.

• Seed script lives in the CentralNotice extension repo (maintenance/SeedTestData.php), not in the catalyst/ci-charts repo
• Running it seeds the banner and enabled campaign the selenium test needs renders #centralnotice_testbanner on the Main Page for anonymous users
• Script skips a banner that already exists
• The catalyst mediawiki chart runs each installed extension's maintenance/SeedTestData.php during provisioning, gated on a seedTestData flag which is off by default
• Seed only runs in opted-in catalyst test envs and never on per-push CI, betacluster selenium, or other catalyst/dev envs
• Verified on a fresh env: after seeding, the CentralNotice selenium test passes (banner is displayed on Main Page)