Revert "MU WPCOM: Port the newspack blocks from the ETK" (#38719)

* Revert "MU WPCOM: Port the newspack blocks from the ETK (#38454)"

This reverts commit 71819c1d506db8c9fa97a4d53bfc102e110418e9.

* Changelog.

---------

Co-authored-by: Igor Zinovyev <zinigor@gmail.com>

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/10253170060

Upstream-Ref: Automattic/jetpack@496e1af

composer.json

@@ -4,7 +4,7 @@
 	"type": "wordpress-plugin",
 	"license": "GPL-2.0-or-later",
 	"require": {
-		"automattic/jetpack-mu-wpcom": "^5.53.0"
+		"automattic/jetpack-mu-wpcom": "^5.53.1-alpha"
 	},
 	"require-dev": {
 		"yoast/phpunit-polyfills": "1.1.0",

vendor/automattic/jetpack-mu-wpcom/CHANGELOG.md

@@ -5,6 +5,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [5.53.1-alpha] - unreleased
+
+This is an alpha version! The changes listed here are not final.
+
 ## [5.53.0] - 2024-08-05
 ### Added
 - Added wpcom-block-editor-nux feature from calypso's ETK package. [#38674]
@@ -1097,6 +1101,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Testing initial package release.
 
+[5.53.1-alpha]: https://github.com/Automattic/jetpack-mu-wpcom/compare/v5.53.0...v5.53.1-alpha
 [5.53.0]: https://github.com/Automattic/jetpack-mu-wpcom/compare/v5.52.1...v5.53.0
 [5.52.1]: https://github.com/Automattic/jetpack-mu-wpcom/compare/v5.52.0...v5.52.1
 [5.52.0]: https://github.com/Automattic/jetpack-mu-wpcom/compare/v5.51.0...v5.52.0