feat(medusa,types,core-flows,utils): added delete endpoints for campaigns and promotions (#6152)

what:

adds delete endpoints for:
- campaigns (RESOLVES CORE-1686)
- promotions (RESOLVES CORE-1680)

.changeset/early-meals-brake.md

@@ -0,0 +1,8 @@
+---
+"@medusajs/medusa": patch
+"@medusajs/types": patch
+"@medusajs/core-flows": patch
+"@medusajs/utils": patch
+---
+
+feat(medusa,types,core-flows,utils): added delete endpoints for campaigns and promotions