[web] Add paymentMethod segment to payment-page-form events (#35583)

* Add paymentMethod segment to `payment-page-form-submit` event

* Add paymentMethod segment to `payment-page-form-success` event

GitOrigin-RevId: 7ad1d18d3f4ed38d39f4336790581604ddae749e

services/web/types/subscription/analytics-event.ts

@@ -3,12 +3,14 @@ import {
   PaymentProvider,
   StripePaymentProviderService,
 } from './dashboard/subscription'
+import { PaymentMethod } from './payment-method'
 import { RecurlyPlanCode } from './plan'
 
 type PaymentPageFormSubmitEventBaseSegmentation = {
   currencyCode: CurrencyCode
   plan_code?: string
   isPaypal: boolean
+  paymentMethod: PaymentMethod
   upgradeType: 'standalone'
   referrer?: string
 }
@@ -46,6 +48,7 @@ type PaymentPageFormSuccessEventStripeSegmentation =
     payment_provider: StripePaymentProviderService
     stripe_price_id: string
     stripe_price_lookup_key: string
+    paymentMethod: PaymentMethod
   }
 
 type PaymentPageFormSuccessEventRecurlySegmentation =