FIX: Invalid URLs could raise exceptions when calling UrlHelper.rails_route_from_url (#10782)

Upload.secure_media_url? raised an exceptions when the URL was invalid,
which was a issue in some situations where secure media URLs must be
removed.

For example, sending digests used PrettyText.strip_secure_media,
which used Upload.secure_media_url? to replace secure media with
placeholders. If the URL was invalid, then an exception would be raised
and left unhandled.

Now instead in UrlHelper.rails_route_from_url we return nil if there is something wrong with the URL.

Co-authored-by: Bianca Nenciu <nenciu.bianca@gmail.com>

lib/url_helper.rb

@@ -70,6 +70,8 @@ class UrlHelper
   def self.rails_route_from_url(url)
     path = URI.parse(encode(url)).path
     Rails.application.routes.recognize_path(path)
+  rescue Addressable::URI::InvalidURIError
+    nil
   end
 
   def self.s3_presigned_url?(url)