[release] remove container images from release artifacts

Container images should be released via a container registry. Including
them in the tarball of the release binaries wastes build time as the
containers are quite large (1G+).

Signed-off-by: Tim Trippel <ttrippel@google.com>

release/BUILD.bazel

@@ -33,7 +33,6 @@ container_bundle(
 pkg_tar(
     name = "provisioning_appliance_binaries",
     srcs = [
-        ":provisioning_appliance_containers_tar",
         "//src/pa:loadtest",
         "//src/pa:pa_server",
         "//src/spm:spm_server",