TBP-370 — clears a tenant's selected plan, putting it in the state a never-onboarded tenant is in. POST /account/test/playwright/clear-tenant-plan Body: { appDomain: string, tenantId: string } Returns: { shouldSelectPlan, shouldSetupPayments, plan } Exists so paywall / plan-selection / checkout E2Es stop deleting the app's `TEAM` plan and recreating it in a `finally` — that workaround mutates shared app state, so any spec running concurrently sees a plan-less app. This touches one tenant and nothing else.