Grant auto-submit on-behalf-of permission to CQ

Bug: b/418015009
Change-Id: I1533d012ced55489f2f71d47c9780b626bf57c68
Reviewed-on: https://pigweed-review.googlesource.com/c/Public-Commit-Queue-Projects/+/291892
Reviewed-by: Oliver Newman <olivernewman@google.com>

project.config

diff --git a/project.config b/project.config
index 373f8d5..de35428 100644
--- a/project.config
+++ b/project.config
@@ -12,6 +12,7 @@
 	copyCondition = changekind:NO_CHANGE
 [access "refs/heads/*"]
 	labelAs-Pigweed-Auto-Submit = +0..+1 group Auto Submit
+	labelAs-Commit-Queue = +0..+2 group Auto Submit
 	label-Commit-Queue = +0..+2 group Administrators
 	label-Commit-Queue = +0..+2 group Auto Submit
 	label-Commit-Queue = +0..+2 group Google Eng