Media: Replace consecutive periods in sanitize_file_name().

On some servers, consecutive periods in a filename can cause a 403 Forbidden response.
This changeset replaces consecutive periods with a single period, and adds related unit tests.

Props ArtZ91, costdev, SergeyBiryukov, arthurshlain, mukesh27.
Fixes #57242.


git-svn-id: https://develop.svn.wordpress.org/trunk@55209 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/formatting.php

@@ -2047,6 +2047,7 @@ function sanitize_file_name( $filename ) {
 
 	$filename = str_replace( $special_chars, '', $filename );
 	$filename = str_replace( array( '%20', '+' ), '-', $filename );
+	$filename = preg_replace( '/\.{2,}/', '.', $filename );
 	$filename = preg_replace( '/[\r\n\t -]+/', '-', $filename );
 	$filename = trim( $filename, '.-_' );