[PM-26012] Add Test-ids to Cart Summary Component (#16497)

* fix: update component with localized messages and data-testids

* fix: update documentation and mock localization logic

* fix: add new messages for cart-summary component

apps/web/src/locales/en/messages.json

@@ -11341,5 +11341,26 @@
   },
   "verifyNow": {
     "message": "Verify now."
+  },
+  "additionalStorageGB": {
+    "message": "Additional storage GB"
+  },
+  "additionalServiceAccountsV2": {
+    "message": "Additional machine accounts"
+  },
+  "secretsManagerSeats": {
+    "message": "Secrets Manager seats"
+  },
+  "additionalStorage": {
+    "message": "Additional Storage"
+  },
+  "expandPurchaseDetails": {
+    "message": "Expand purchase details"
+  },
+  "collapsePurchaseDetails": {
+    "message": "Collapse purchase details"
+  },
+  "familiesMembership": {
+    "message": "Families membership"
   }
 }