Bug 1791475 - Move valgrind builds to GCP. r=taskgraph-reviewers,jmaher

Differential Revision: https://phabricator.services.mozilla.com/D157686

taskcluster/ci/valgrind/kind.yml

@@ -28,7 +28,7 @@ jobs:
             symbol: V-swr
             kind: build
             tier: 1
-        worker-type: b-linux-aws
+        worker-type: b-linux
         worker:
             docker-image: {in-tree: valgrind-build}
             max-run-time: 72000