infra: Migrate lacros CQ bot to builderfull.

crrev.com/i/3411588 allocates the machines for this pool.

Bug: 1140727
Change-Id: Id46bcf1917fe7eca740d1401550dd57553be337c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2544862
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828415}

infra/config/generated/cr-buildbucket.cfg

@@ -33270,7 +33270,7 @@ buckets {
       name: "linux-lacros-rel"
       swarming_host: "chromium-swarm.appspot.com"
       swarming_tags: "vpython:native-python-wrapper"
-      dimensions: "builderless:1"
+      dimensions: "builder:linux-lacros-rel"
       dimensions: "cores:16"
       dimensions: "cpu:x86-64"
       dimensions: "os:Ubuntu-16.04"

infra/config/subprojects/chromium/try.star

@@ -689,6 +689,7 @@ try_.chromium_chromiumos_builder(
 
 try_.chromium_chromiumos_builder(
     name = "linux-lacros-rel",
+    builderless = not settings.is_master,
     cores = 16,
     ssd = True,
     goma_jobs = goma.jobs.J300,