feat(dashboard): Update v2 store domain to follow conventions, and abstract some logic (#6927)

**What**
- Updates the V2 store domain.
- Abstracts some of the API requests logic into re-usable hooks

**Note**
- Partial PR as we need to add support for setting a default currency, region and location. Currently the `q` param is missing on all V2 endpoints, so we can't use our combobox component to list these options. Will be added later when that has been fixed in core.
- The PR includes a generic hook for fetching combobox data, that I added before realising that `q` is not currently supported. But keeping it as it will be useful once support is added.

packages/admin-next/dashboard/src/hooks/use-combobox-data.tsx

@@ -0,0 +1,71 @@
+import { QueryKey, useInfiniteQuery } from "@tanstack/react-query"
+import debounce from "lodash/debounce"
+import { useCallback, useEffect, useState } from "react"
+
+type Params = {
+  q: string
+  limit: number
+  offset: number
+}
+
+type Page = {
+  count: number
+  offset: number
+  limit: number
+}
+
+type UseComboboxDataProps<TParams extends Params, TRes extends Page> = {
+  fetcher: (params: TParams) => Promise<TRes>
+  params?: Omit<TParams, "q" | "limit" | "offset">
+  queryKey: QueryKey
+}
+
+/**
+ * Hook for fetching infinite data for a combobox.
+ */
+export const useComboboxData = <TParams extends Params, TRes extends Page>({
+  fetcher,
+  params,
+  queryKey,
+}: UseComboboxDataProps<TParams, TRes>) => {
+  const [query, setQuery] = useState("")
+  const [debouncedQuery, setDebouncedQuery] = useState("")
+
+  // eslint-disable-next-line react-hooks/exhaustive-deps
+  const debouncedUpdate = useCallback(
+    debounce((query) => setDebouncedQuery(query), 300),
+    []
+  )
+
+  useEffect(() => {
+    debouncedUpdate(query)
+
+    return () => debouncedUpdate.cancel()
+  }, [query, debouncedUpdate])
+
+  const data = useInfiniteQuery(
+    [...queryKey, debouncedQuery],
+    async ({ pageParam = 0 }) => {
+      const res = await fetcher({
+        q: debouncedQuery,
+        limit: 10,
+        offset: pageParam,
+        ...params,
+      } as TParams)
+      return res
+    },
+    {
+      getNextPageParam: (lastPage) => {
+        const morePages = lastPage.count > lastPage.offset + lastPage.limit
+        return morePages ? lastPage.offset + lastPage.limit : undefined
+      },
+      keepPreviousData: true,
+    }
+  )
+
+  return {
+    ...data,
+    query,
+    setQuery,
+  }
+}