Stop traffic to mac-coverage-rel.

The experiment has been concluded and coverage would be enabled on mac-rel itself

Bug: 1024915
Change-Id: I13b998b5261b9720437a42d387ce29fbc73b9e38
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2440082
Commit-Queue: Prakhar Asthana <pasthana@google.com>
Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Auto-Submit: Prakhar Asthana <pasthana@google.com>
Cr-Commit-Position: refs/heads/master@{#814996}

infra/config/generated/commit-queue.cfg

@@ -1281,10 +1281,7 @@ config_groups {
       }
       builders {
         name: "chromium/try/mac-coverage-rel"
-        experiment_percentage: 8
-        location_regexp: ".*"
-        location_regexp_exclude: ".+/[+]/docs/.+"
-        location_regexp_exclude: ".+/[+]/infra/config/.+"
+        includable_only: true
       }
       builders {
         name: "chromium/try/mac-dawn-rel"

infra/config/generated/cq-builders.md

@@ -367,6 +367,3 @@ as required builders.
 * [linux-rel-builderful](https://ci.chromium.org/p/chromium/builders/try/linux-rel-builderful) ([definition](https://cs.chromium.org/search?q=package:%5Echromium$+file:/cq.star$+-file:/beta/+-file:/stable/+linux-rel-builderful)) ([matching builders](https://cs.chromium.org/search?q=+file:trybots.py+linux-rel-builderful))
   * Experiment percentage: 10
 
-* [mac-coverage-rel](https://ci.chromium.org/p/chromium/builders/try/mac-coverage-rel) ([definition](https://cs.chromium.org/search?q=package:%5Echromium$+file:/cq.star$+-file:/beta/+-file:/stable/+mac-coverage-rel)) ([matching builders](https://cs.chromium.org/search?q=+file:trybots.py+mac-coverage-rel))
-  * Experiment percentage: 8
-

infra/config/subprojects/chromium/try.star

@@ -1110,12 +1110,12 @@ try_.chromium_linux_builder(
     executable = "recipe:tricium_metrics",
 )
 
+# TODO(crbug/1024915): Remove this once coverage is enabled on mac by default
 try_.chromium_mac_builder(
     name = "mac-coverage-rel",
     builderless = False,
     use_clang_coverage = True,
     goma_jobs = goma.jobs.J150,
-    tryjob = try_.job(experiment_percentage = 8),
 )
 
 try_.chromium_mac_builder(