Allow coupons Memberships gifts and coupons CPT types and metas (#40541)

* whitelist coupons and gifts cpt types and metas
* Changelogs
* Gift and coupons CPT setup
* Update class-jetpack-memberships.php

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/12295218472

Upstream-Ref: Automattic/jetpack@d349c0a

composer.json

@@ -11,7 +11,7 @@
 		"automattic/jetpack-status": "^5.0.1",
 		"automattic/jetpack-config": "^3.0.0",
 		"automattic/jetpack-my-jetpack": "^5.1.2-alpha",
-		"automattic/jetpack-sync": "^4.1.0"
+		"automattic/jetpack-sync": "^4.1.1-alpha"
 	},
 	"require-dev": {
 		"automattic/jetpack-changelogger": "^5.1.0",