[infra] Update active lucicfg experiments. Remove retired noop experiments and add the one needed for the ongoing luci-scheduler.cfg format migration. R: jmadill@chromium.org Bug: chromium:1182002 Change-Id: I759e03f8fd189682c282af0b8a0b108815b46329 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3449242 Auto-Submit: Vadim Shtayura <vadimsh@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>