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>

.changeset/warm-rings-look.md

@@ -0,0 +1,7 @@
+---
+"@medusajs/medusa": patch
+"@medusajs/types": patch
+"@medusajs/dashboard": patch
+---
+
+fix: Update TIP on promotions