Bug 1911702 - allow bugbug test loader to be used when available for reftest/crashtest. r=ahal

Differential Revision: https://phabricator.services.mozilla.com/D218608

layout/generic/crashtests/crashtests.list

@@ -811,7 +811,7 @@ load 1776079.html
 asserts(0-2) load 1791606.html
 load 1799749.html
 asserts(0-1) load 1807958.html # asserts from integer overflow & bogus sizes
-load 1816574.html
+asserts(0-14) load 1816574.html # Bug 1913247
 load 1821603.html
 load 1822118.html
 load 1825434.html

taskcluster/kinds/test/reftest.yml

@@ -11,7 +11,6 @@ task-defaults:
             android-hw-.*: geckoview-test_runner.apk
             default: null
     tier: default
-    test-manifest-loader: default
     mozharness:
         script:
             by-test-platform:

taskcluster/test/test_mach_try_auto.py

@@ -50,7 +50,7 @@ def test_only_important_manifests(params, full_task_graph, filter_tasks):
             ]
 
             # Manifest scheduling is disabled for mochitest-ally.
-            if attr("unittest_suite") in ["mochitest-a11y", "crashtest", "reftest"]:
+            if attr("unittest_suite") in ["mochitest-a11y"]:
                 assert len(unimportant) > 0
             else:
                 assert unimportant == []