Add last touched date to issues by user table

For reviewing the issues by user ([https://osmose.openstreetmap.fr/en/byuser/arjunaraoc?level=2#loc=7/17.442/79.185)](example url), adding last touched date and sorting the result based on descending order will be helpful for users to focus on recent issues, as some old issues might have been reviewed and ignored for various reasons such as not fixable.