fix(medusa, core-flows): Update TIP on promotions (#12885)

* fix: Update TIP on promotions

* Create warm-rings-look.md

* only show for fixed discounts

* fix: handle type change

---------

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

integration-tests/http/__tests__/promotions/admin/promotions.spec.ts

@@ -1731,6 +1731,7 @@ medusaIntegrationTestRunner({
             {
               code: "TEST_TWO",
               application_method: { value: 200 },
+              is_tax_inclusive: true,
             },
             adminHeaders
           )
@@ -1743,6 +1744,7 @@ medusaIntegrationTestRunner({
               application_method: expect.objectContaining({
                 value: 200,
               }),
+              is_tax_inclusive: true,
             })
           )
         })