infra: validate configs using lucicfg tool in PRESUBMIT.py This validates that: a) checked in generated files correspond to what lucicfg actually generates; b) lucicfg is formatted c) (same as before) configs are validated against respective LUCI services. Change-Id: I727723beb4172c3dd265c4a4edbc2ecbfb479eb9 Bug: chromium:1204972 No-Try: True Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2867081 Commit-Queue: Andrii Shyshkalov <tandrii@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>