tests: Fix PHPUnit 12.5 whining about mocks versus stubs (#46260)

PHPUnit 12.5 has started complaining about the use of mocks when stubs
would be sufficient. Unfortunately the ability to create partial stubs
was only added in 12.5.1, so in many cases we have to just set the
attribute to ignore the complaints.

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/20144146632

Upstream-Ref: Automattic/jetpack@6e2cd72

Author: anomiex

composer.json

@@ -5,7 +5,7 @@
 	"license": "GPL-2.0-or-later",
 	"require-dev": {
 		"yoast/phpunit-polyfills": "^4.0.0",
-		"automattic/jetpack-changelogger": "^6.0.11",
+		"automattic/jetpack-changelogger": "^6.0.12-alpha",
 		"automattic/phpunit-select-config": "^1.0.3"
 	},
 	"autoload": {