drop COMMIT-QUEUE.ini

Nothing reads this file anymore.

BUG=chromium:1025955
TEST=CQ passes
Exempt-From-Owner-Approval: cleanup removing unused file

Change-Id: If2caef69304d2bedc3eb2b1ee0d9da71a9f86917
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/cobble/+/2003930
Tested-by: Ross Zwisler <zwisler@google.com>
Auto-Submit: Ross Zwisler <zwisler@google.com>
Reviewed-by: Sean Abraham <seanabraham@chromium.org>
Commit-Queue: Sean Abraham <seanabraham@chromium.org>