[attest] Remove cloud SDK from image

It's unused.

Bug: b/571882539
Change-Id: I17da2b807b23c0c58b7efc41aba4c2ba4256f69f
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/1389697
Reviewed-by: Florin Malita <fmalita@google.com>
Commit-Queue: Florin Malita <fmalita@google.com>
Auto-Submit: Eric Boren <borenet@google.com>

attest/BUILD.bazel

diff --git a/attest/BUILD.bazel b/attest/BUILD.bazel
index c29547d..eaa070e 100644
--- a/attest/BUILD.bazel
+++ b/attest/BUILD.bazel
@@ -9,10 +9,6 @@
                 "//attest/go/attest:attest",
                 "0755",
             ],
-            [
-                "@google_cloud_sdk//:all_files",
-                "0755",
-            ],
         ],
     },
     repository = "skia-public/attest",