feat(dashboard,core-flows,js-sdk,types,link-modules,payment): ability to copy payment link (#8630)

what: 

- enables a button to create a payment link when a payment delta is present
- api to delete order payment collection
- adds a pending amount to payment collections

Note: Not the happiest with the decision on when to create a payment collection and when not to. The code should programatically create or delete payment collections currently to generate the right collection for the payment delta. Adding a more specific flow to create and manage a payment collection will help reduce this burden from the code path and onto CX/merchant.

Another issue I found is that the payment collection status doesn't get updated when payment is complete as it still gets stuck to "authorized" state

https://github.com/user-attachments/assets/037a10f9-3621-43c2-94ba-1ada4b0a041b

packages/admin-next/dashboard/vite.config.mts

@@ -8,6 +8,8 @@ export default defineConfig(({ mode }) => {
 
   const BASE = env.VITE_MEDUSA_BASE || "/"
   const BACKEND_URL = env.VITE_MEDUSA_BACKEND_URL || "http://localhost:9000"
+  const STOREFRONT_URL =
+    env.VITE_MEDUSA_STOREFRONT_URL || "http://localhost:8000"
 
   /**
    * Add this to your .env file to specify the project to load admin extensions from.
@@ -25,6 +27,7 @@ export default defineConfig(({ mode }) => {
     define: {
       __BASE__: JSON.stringify(BASE),
       __BACKEND_URL__: JSON.stringify(BACKEND_URL),
+      __STOREFRONT_URL__: JSON.stringify(STOREFRONT_URL),
     },
     server: {
       open: true,