[watcher] core reviewers update

Hello Watcher team, Some of core contributors are inactive for a year or more and their priorities have been changed. I suggest to remove the following contributors from core reviewers of Watcher: - Joe Cropper - Prashanth Hari - Prudhvi Rao Shedimbi - Susanne Balle - Vincent Francoise - David Tardivel If some of them would like to get back to work on Watcher, I see no barriers for that. Best Regards, ____ Alex