Throttle submits from the CQ.

There is likely to be a large backlog of CLs to submit that built up
during the network outage. Throttling the submits that land will prevent
large blamelists for CI runs.

Bug: 1108842
Change-Id: I117c89082640bb30daf12b2bf5daa2e1b25c323f
No-Try: true
No-Tree-Checks: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2317760
Auto-Submit: Garrett Beaty <gbeaty@chromium.org>
Reviewed-by: Erik Staab <estaab@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Erik Staab <estaab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791308}

infra/config/generated/commit-queue.cfg

@@ -6,9 +6,9 @@
 
 cq_status_host: "chromium-cq-status.appspot.com"
 submit_options {
-  max_burst: 2
+  max_burst: 1
   burst_delay {
-    seconds: 60
+    seconds: 300
   }
 }
 config_groups {

infra/config/main.star

@@ -73,8 +73,8 @@ luci.project(
 )
 
 luci.cq(
-    submit_max_burst = 2,
-    submit_burst_delay = time.minute,
+    submit_max_burst = 1,
+    submit_burst_delay = 5 * time.minute,
     status_host = 'chromium-cq-status.appspot.com',
 )