feat(promotion, dashboard, core-flows, cart, types, utils, medusa): tax inclusive promotions (#12412)

* feat: tax inclusive promotions

* feat: add a totals test case

* feat: add integration test

* chore: changeset

* fix: typo

* chore: refactor

* fix: tests

* fix: rest of buyget action tests

* fix: cart spec

* chore: expand integration test with item level totals

* feat: add a few more test cases

---------

Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>

packages/medusa/src/api/admin/promotions/query-config.ts

@@ -2,6 +2,7 @@ export const defaultAdminPromotionFields = [
   "id",
   "code",
   "is_automatic",
+  "is_tax_inclusive",
   "type",
   "status",
   "created_at",

packages/medusa/src/api/admin/promotions/validators.ts

@@ -163,6 +163,7 @@ export const CreatePromotion = z
     code: z.string(),
     is_automatic: z.boolean().optional(),
     type: z.nativeEnum(PromotionType),
+    is_tax_inclusive: z.boolean().optional(),
     status: z.nativeEnum(PromotionStatus).default(PromotionStatus.DRAFT),
     campaign_id: z.string().nullish(),
     campaign: CreateCampaign.optional(),