Billing/pm 26686/update upgrade account component to be responsive (#16808)

* fix(billing): Update initialization of payment component

* fix(billing): Add more signal validation

* fix(billing): Add responsiveness to upgrade-account component

apps/web/src/app/billing/individual/upgrade/upgrade-payment/upgrade-payment.component.html

@@ -26,6 +26,7 @@
       <section>
         @if (passwordManager) {
           <billing-cart-summary
+            #cartSummaryComponent
             [passwordManager]="passwordManager"
             [estimatedTax]="estimatedTax"
           ></billing-cart-summary>