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/modules/cart/src/migrations/.snapshot-medusa-cart.json

@@ -998,6 +998,16 @@
           "nullable": false,
           "mappedType": "decimal"
         },
+        "is_tax_inclusive": {
+          "name": "is_tax_inclusive",
+          "type": "boolean",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": false,
+          "nullable": false,
+          "default": "false",
+          "mappedType": "boolean"
+        },
         "provider_id": {
           "name": "provider_id",
           "type": "text",

packages/modules/cart/src/migrations/Migration20250508081553.ts

@@ -0,0 +1,13 @@
+import { Migration } from '@mikro-orm/migrations';
+
+export class Migration20250508081553 extends Migration {
+
+  override async up(): Promise<void> {
+    this.addSql(`alter table if exists "cart_line_item_adjustment" add column if not exists "is_tax_inclusive" boolean not null default false;`);
+  }
+
+  override async down(): Promise<void> {
+    this.addSql(`alter table if exists "cart_line_item_adjustment" drop column if exists "is_tax_inclusive";`);
+  }
+
+}

packages/modules/cart/src/models/line-item-adjustment.ts

@@ -9,6 +9,7 @@ const LineItemAdjustment = model
       description: model.text().nullable(),
       code: model.text().nullable(),
       amount: model.bigNumber(),
+      is_tax_inclusive: model.boolean().default(false),
       provider_id: model.text().nullable(),
       promotion_id: model.text().nullable(),
       metadata: model.json().nullable(),