Site Health: Ensure each alloptions value is serialized.

This adds additional hardening to the Autoload options Health Check to avoid potential bugs when extenders return unserialzed values from `wp_load_alloptions()`.

Follow-up to [58332].

Props mukesh27, joemcgill, westonruter.
Fixes #61276.


git-svn-id: https://develop.svn.wordpress.org/trunk@58338 602fd350-edb4-49c9-b593-d223f7449a82

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

@@ -2598,8 +2598,11 @@ public function get_autoloaded_options_size() {
 
 		$total_length = 0;
 
-		foreach ( $alloptions as $option_name => $option_value ) {
-			$total_length += strlen( $option_value );
+		foreach ( $alloptions as $option_value ) {
+			if ( is_array( $option_value ) || is_object( $option_value ) ) {
+				$option_value = maybe_serialize( $option_value );
+			}
+			$total_length += strlen( (string) $option_value );
 		}
 
 		return $total_length;