Based on the Hide CI code used in OpenStack's Gerrit. For the use with Wikimedia's Gerrit installation, I changed the necessary lines.
The script is ready for use in Google Chrome as a user script, or an unpacked extension (turn developer mode on). It should be possible to use this script in an userscript management addon for Chrome or any other browser, too.
After the installation is finished, the script will be triggered on all URL's matching https://gerrit.wikimedia.org/r/#/c/*. It will parse the comments added by jenkins-bot (the CI account for Wikimedia's CI infrastructure) and adds the very latest tests to the top, at the right side of the reviewer list. There is also an option to hide all comments from jenkins-bot to make the comments list much more readable (if you don't need to scroll through all test comments).