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

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

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

@@ -187,6 +187,7 @@ export const UpdatePromotion = z
   .object({
     code: z.string().optional(),
     is_automatic: z.boolean().optional(),
+    is_tax_inclusive: z.boolean().optional(),
     type: z.nativeEnum(PromotionType).optional(),
     status: z.nativeEnum(PromotionStatus).optional(),
     campaign_id: z.string().nullish(),