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/src/vite-env.d.ts

@@ -2,6 +2,7 @@
 
 interface ImportMetaEnv {
   readonly VITE_MEDUSA_ADMIN_BACKEND_URL: string
+  readonly VITE_MEDUSA_STOREFRONT_URL: string
   readonly VITE_MEDUSA_V2: "true" | "false"
 }
 
@@ -10,4 +11,5 @@ interface ImportMeta {
 }
 
 declare const __BACKEND_URL__: string | undefined
+declare const __STOREFRONT_URL__: string | undefined
 declare const __BASE__: string