Revert "Bug 1798886 - Migrate code-coverage from AWS to GCP (#1634)" (#1675)

This reverts commit 9366703.

Author: marco-c

.taskcluster.yml

@@ -65,7 +65,7 @@ tasks:
 
     workerType:
       $if: 'taskcluster_root_url == "https://firefox-ci-tc.services.mozilla.com"'
-      then: linux-gcp
+      then: linux
       else: ci
 
     taskboot_image: "mozilla/taskboot:0.2.2"