Use `remove_added_uploads()` in `tearDown()` for XMLRPC tests

This cleanup avoids false test failures due to incrementing filenames in the uploads directory.

Fixes #30290


git-svn-id: https://develop.svn.wordpress.org/trunk@30279 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/includes/testcase-xmlrpc.php

@@ -16,6 +16,7 @@ class WP_XMLRPC_UnitTestCase extends WP_UnitTestCase {
 
 	function tearDown() {
 		remove_filter( 'pre_option_enable_xmlrpc', '__return_true' );
+		$this->remove_added_uploads();
 
 		parent::tearDown();
 	}