Full sync: Send context for initial full sync action (#40930)

* Add a new parameter to the  functions in the  class to specify the context in which the full sync was initiated

* changelog

* Versioning is for the package

* Fixed doc since empty is not used and added context

* Updated type for context in the endpoint definition

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/12805468078

Upstream-Ref: Automattic/jetpack@0cb4b07

composer.json

@@ -11,7 +11,7 @@
 		"automattic/jetpack-plans": "^0.5.1",
 		"automattic/jetpack-redirect": "^3.0.1",
 		"automattic/jetpack-status": "^5.0.1",
-		"automattic/jetpack-sync": "^4.3.0"
+		"automattic/jetpack-sync": "^4.4.0-alpha"
 	},
 	"require-dev": {
 		"yoast/phpunit-polyfills": "^1.1.1",