Add --noremote_cache_async

Addressing hanging issue on macOS: bazelbuild/bazel#25232

https://buildkite.com/bazel/google-bazel-presubmit/builds/90602#0195d6ff-3ef7-4962-8048-152f30cdb502

Author: meteorcloudy

buildkite/bazelci.py

@@ -1811,7 +1811,9 @@ def remote_caching_flags(platform, accept_cached=True):
     if is_mac():
         bucket_id = "trusted" if THIS_IS_TRUSTED else "untrusted"
         remote_cache_flags = [
-            f"--remote_cache=https://storage.googleapis.com/bazel-{bucket_id}-build-cache"
+            f"--remote_cache=https://storage.googleapis.com/bazel-{bucket_id}-build-cache",
+            # TODO: remove after fixing https://github.com/bazelbuild/bazel/issues/25232
+            "--noremote_cache_async",
         ]
     else:
         remote_cache_flags = [