feat(core-flows,medusa,types,utils): rename psma to prices (#6796)

What:

Renames pricesetmoneyamount to prices

Co-authored-by: Adrien de Peretti <25098370+adrien2p@users.noreply.github.com>

integration-tests/modules/helpers/create-variant-price-set.ts

@@ -41,6 +41,6 @@ export const createVariantPriceSet = async ({
   })
 
   return await pricingModuleService.retrieve(priceSet.id, {
-    relations: ["price_set_money_amounts"],
+    relations: ["prices"],
   })
 }