publish: set stubs for migrated publishes

rdb, gcs, and cpcon publishes have been moved to infra/infra. Remove these services and set them as stubs pointing to their new source.

BUG=b:393597613
TEST=CQ+1

Change-Id: I1cbdc7685eb25182c590149d2af315d8c5d0c387
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/6457714
Commit-Queue: Chris DeLaGarza <cdelagarza@google.com>
Tested-by: Chris DeLaGarza <cdelagarza@google.com>
Reviewed-by: Azizur Rahman <azrahman@google.com>