Bug 1608954 - Remove legacy Stylo-disabled SYsd AWSY test r=perftest-reviewers,maja_zf

Differential Revision: https://phabricator.services.mozilla.com/D61640

--HG--
extra : moz-landing-system : lando

taskcluster/ci/config.yml

@@ -83,7 +83,6 @@ treeherder:
         'tt-1proc': 'Telemetry tests without e10s'
         'SY': 'Are we slim yet tests by TaskCluster'
         'SY-fis': 'Are we slim yet tests by TaskCluster, fission enabled'
-        'SYsd': 'Are we slim yet tests by TaskCluster, Stylo disabled'
         'VP': 'VideoPuppeteer tests'
         'W': 'Web platform tests'
         'W-1proc': 'Web platform tests without e10s'

taskcluster/taskgraph/transforms/job/mozharness_test.py

@@ -33,7 +33,6 @@ VARIANTS = [
     'pgo',
     'asan',
     'stylo',
-    'stylo-disabled',
     'qr',
     'ccov',
 ]