CQ added support to project-scoped accounts instead of previously
hardcoded commit-bot@ for working with Gerrit.

R=ehmaldonado

Test: `git cl status` on this very CL :)
Bug: 911811
Change-Id: I8f48a7bdc9dad9a5b71d266ccf7e9a493aa94aa9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2095986Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Auto-Submit: Andrii Shyshkalov <tandrii@google.com>