Combine disallow-file-mods and no-languages test plugins into one

Co-authored-by: swissspidy <841956+swissspidy@users.noreply.github.com>

Author: Copilot

.wp-env.json

@@ -3,7 +3,6 @@
 	"plugins": [
 		".",
 		"./tests/e2e/plugins/custom-internationalized-plugin",
-		"./tests/e2e/plugins/disallow-file-mods",
 		"./tests/e2e/plugins/merge-translations",
 		"./tests/e2e/plugins/no-languages",
 		"./tests/e2e/plugins/no-merge-translations"

tests/e2e/plugins/disallow-file-mods/disallow-file-mods.php

@@ -8,5 +8,6 @@
 Domain Path: languages/
 */
 
+add_filter( 'file_mod_allowed', '__return_false' );
 add_filter( 'get_available_languages', '__return_empty_array' );
 add_filter( 'wp_get_available_translations', '__return_empty_array' );