Refactor billing components and enhance UX

This commit includes significant changes to the layout and presentation of billing related components. The most notable updates are replacing the static back button in 'billing-session-status.tsx' with a fully clickable link button, and improving the product description lookup to use i18n in 'current-subscription-card.tsx'. Additionally, the general structure and spacing of elements within 'billing/page.tsx' are enhanced for better user experience.

packages/billing/gateway/src/components/billing-session-status.tsx

@@ -78,17 +78,15 @@ function SuccessSessionStatus({
           </p>
         </div>
 
-        <Button data-test={'checkout-success-back-button'} variant={'outline'}>
-          <Link href={redirectPath}>
-            <span className={'flex items-center space-x-2.5'}>
-              <span>
-                <Trans i18nKey={'billing:checkoutSuccessBackButton'} />
-              </span>
-
-              <ChevronRight className={'h-4'} />
+        <Link data-test={'checkout-success-back-link'} href={redirectPath}>
+          <Button>
+            <span>
+              <Trans i18nKey={'billing:checkoutSuccessBackButton'} />
             </span>
-          </Link>
-        </Button>
+
+            <ChevronRight className={'h-4'} />
+          </Button>
+        </Link>
       </div>
     </section>
   );