feat(medusa,types): create promotion flows (#7029)

* chore: create promotion phase

* chore: fix specs + minor ui changes

* chore: minor fixes

* chore: added changeset

* address pr reviews

* chore: fix spec

* Update packages/admin-next/dashboard/src/v2-routes/promotions/common/edit-rules/edit-rules.tsx

Co-authored-by: Frane Polić <16856471+fPolic@users.noreply.github.com>

* chore: fix specs

---------

Co-authored-by: Frane Polić <16856471+fPolic@users.noreply.github.com>

packages/admin-next/dashboard/src/hooks/api/promotions.tsx

@@ -29,7 +29,7 @@ import {
 const PROMOTIONS_QUERY_KEY = "promotions" as const
 export const promotionsQueryKeys = {
   ...queryKeysFactory(PROMOTIONS_QUERY_KEY),
-  listRules: (id: string, ruleType: string) => [
+  listRules: (id: string | null, ruleType: string) => [
     PROMOTIONS_QUERY_KEY,
     id,
     ruleType,
@@ -60,7 +60,7 @@ export const usePromotion = (
 }
 
 export const usePromotionRules = (
-  id: string,
+  id: string | null,
   ruleType: string,
   options?: Omit<
     UseQueryOptions<