This patch prevents the visual-metrics tasks from scheduling browsertime tests on mozilla-central by removing the run-on-projects setting (setting it to []). The run-on-projects setting is now set during the visual-metrics transformation so that it is the same as the dependent task so it will only run on projects that the dependent task runs on. Also, this patch enables browsertime TP6-1 on mozilla-central for chrome, firefox and geckoview.
Differential Revision: https://phabricator.services.mozilla.com/D52061
--HG--
extra : moz-landing-system : lando