Site Health: Move "The folder ... was detected as being under version control" message from failure to warning.

Props afragen, davidbaumwald.
Fixes #47982.

git-svn-id: https://develop.svn.wordpress.org/trunk@46281 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/class-wp-site-health-auto-updates.php

@@ -287,7 +287,7 @@ class WP_Site_Health_Auto_Updates {
 					'<code>' . $check_dir . '</code>',
 					"<code>$vcs_dir</code>"
 				),
-				'severity'    => 'fail',
+				'severity'    => 'warning',
 			);
 		}