Full sync: Set chunk size of comments dynamically (#41350)

* Move filter_objects_and_metadata_by_size to module class and use it by posts and comments

* changelog

* Fixed tests

* changelog

* ID for comments is not an int so let's cast before comparing

* Added tests for comments

* Id field for posts is ID

* Added tests to cover filter_objects_and_metadata_by_size

* Replace deprecated method

* Typo in docblocks

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/13050060760

Upstream-Ref: Automattic/jetpack@d705b87

composer.json

@@ -17,7 +17,7 @@
 		"automattic/jetpack-constants": "^3.0.1",
 		"automattic/jetpack-plans": "^0.5.1",
 		"automattic/jetpack-status": "^5.0.2",
-		"automattic/jetpack-sync": "^4.5.1-alpha",
+		"automattic/jetpack-sync": "^4.6.0-alpha",
 		"automattic/jetpack-protect-status": "^0.4.2"
 	},
 	"require-dev": {