Feature summary:
Follow up to T289480: Allow excluding certain messages from validation

We want to be able to exclude running certain validation on certain messages and the target translation language

Use case(s):

Currently there are lot of validation exclusions listed in the validation-exclusions in Translatewiki. See: https://github.com/wikimedia/translatewiki/blob/master/groups/validation-exclusion-list.php

Eg:

[
	'group' => 'core',
	'check' => 'plural',
	'code' => [ 'fr' ],
	'message' => [
		'viewcount', // PLURAL not needed in French
	]
],