Implements the form for renaming the new filename on the file edit page

What does this MR do?

Adds the possibility to edit a filename when editing the content of a file on Gitlab

this MR was made to solve #5850 (closed)

app/services/files/base_service.rb

@@ -15,6 +15,8 @@ module Files
                           params[:file_content]
                         end
+      puts @file_path
+
       # Validate parameters
       validate