Bug 1795042 - [ci] Migrate 'github-sync' tasks from AWS -> GCP, r=MasterWayZ

Depends on D159872

Differential Revision: https://phabricator.services.mozilla.com/D159873

taskcluster/ci/github-sync/kind.yml

@@ -17,7 +17,7 @@ job-defaults:
     attributes:
         retrigger: true
     run-on-projects: ['mozilla-central']
-    worker-type: b-linux
+    worker-type: b-linux-gcp
     treeherder:
         platform: other/opt
         tier: 2