skylab_local_state: add RemoveRequest

Change-Id: I03fd3bd70ef59dad25afce1d71b015c69247c85a
Bug: b/197356031
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/3130348
Auto-Submit: Jared Loucks <jaredloucks@google.com>
Reviewed-by: Otabek Kasimov <otabek@google.com>
Commit-Queue: Jared Loucks <jaredloucks@google.com>
3 files changed