Update active lucicfg experiments.

Remove retired noop experiments and add the one needed for the
ongoing luci-scheduler.cfg format migration.

Change-Id: If74c6e0664cce2fd75cf93932f763de5da1a9090
Reviewed-on: https://chromium-review.googlesource.com/c/codecs/infra/+/3449840
Reviewed-by: James Zern <jzern@google.com>
Commit-Queue: James Zern <jzern@google.com>
4 files changed