[PM-21934] Upgrade to eslint 9 (#14754)

Upgrades to Eslint v9. Since this is a major version there were breaking changes, but since we've previously migrated to flat configs in #12806 those were minimal.

apps/web/src/app/billing/shared/payment-method.component.ts

@@ -143,6 +143,8 @@ export class PaymentMethodComponent implements OnInit, OnDestroy {
 
       [this.billing, this.sub] = await Promise.all([billingPromise, subPromise]);
     }
+    // TODO: Eslint upgrade. Please resolve this since the ?? does nothing
+    // eslint-disable-next-line no-constant-binary-expression
     this.isUnpaid = this.subscription?.status === "unpaid" ?? false;
     this.loading = false;
     // If the flag `launchPaymentModalAutomatically` is set to true,