chore: move next admin packages to core repo (#5983)

**What**
- Move packages for `next` version of admin to core repo

**Other**
- Since this PR introduces packages that depend on Vite 5, it also introduces @types/node@^20. We have never had a direct dependency on the types package for Node, and as far as I can see that has resulted in us using the types from Node.js@8, as those are a dependency of one of our dependencies. With the introduction of @types/node@^20, two of our packages had TS errors because they were using the NodeJS.Timer type, which was deprecated in Node.js@14. We should add specific @types/node packages to all our packages, but I haven't done so in this PR to keep it as clean as possible.
- Q: @olivermrbl I've added the new packages to the ignore list for changeset, is this enough to prevent them from being published?

packages/admin-next/admin-shared/src/constants.ts

@@ -0,0 +1,59 @@
+export const injectionZones = [
+  // Order injection zones
+  "order.details.before",
+  "order.details.after",
+  "order.list.before",
+  "order.list.after",
+  // Draft order injection zones
+  "draft_order.list.before",
+  "draft_order.list.after",
+  "draft_order.details.before",
+  "draft_order.details.after",
+  // Customer injection zones
+  "customer.details.before",
+  "customer.details.after",
+  "customer.list.before",
+  "customer.list.after",
+  // Customer group injection zones
+  "customer_group.details.before",
+  "customer_group.details.after",
+  "customer_group.list.before",
+  "customer_group.list.after",
+  // Product injection zones
+  "product.details.before",
+  "product.details.after",
+  "product.list.before",
+  "product.list.after",
+  "product.details.side.before",
+  "product.details.side.after",
+  // Product collection injection zones
+  "product_collection.details.before",
+  "product_collection.details.after",
+  "product_collection.list.before",
+  "product_collection.list.after",
+  // Product category injection zones
+  "product_category.details.before",
+  "product_category.details.after",
+  "product_category.list.before",
+  "product_category.list.after",
+  // Price list injection zones
+  "price_list.details.before",
+  "price_list.details.after",
+  "price_list.list.before",
+  "price_list.list.after",
+  // Discount injection zones
+  "discount.details.before",
+  "discount.details.after",
+  "discount.list.before",
+  "discount.list.after",
+  // Gift card injection zones
+  "gift_card.details.before",
+  "gift_card.details.after",
+  "gift_card.list.before",
+  "gift_card.list.after",
+  "custom_gift_card.before",
+  "custom_gift_card.after",
+  // Login
+  "login.before",
+  "login.after",
+] as const

packages/admin-next/admin-shared/src/index.ts

@@ -0,0 +1,2 @@
+export * from "./constants"
+export * from "./types"

packages/admin-next/admin-shared/src/types.ts

@@ -0,0 +1,3 @@
+import { injectionZones } from "./constants"
+
+export type InjectionZone = (typeof injectionZones)[number]