Remove support for publishing plugin to the GCP registry

Author: misraved

.github/workflows/registry-publish.yml

@@ -6,12 +6,6 @@ on:
       - 'v*'
 
 jobs:
-  registry_publish_workflow:
-    uses: turbot/steampipe-workflows/.github/workflows/registry-publish.yml@main
-    secrets: inherit
-    with:
-      releaseTimeout: 60m
-      
   registry_publish_workflow_ghcr:
     uses: turbot/steampipe-workflows/.github/workflows/registry-publish-ghcr.yml@main
     secrets: inherit