Run Bazel test suite on Linux ARM64 platform

Use `Single.using` instead of `onError`/`onSuccess` for async uploads

Failed in 3m 27s
:ubuntu: Ubuntu 20.04 LTS ARM64curl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1739207162 -o bazelci.py && python3.8 bazelci.py runner --task=ubuntu2004_arm64 --http_config=https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/pipelines/bazel-linux-arm64.yml?1739207162
Waited 1s
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Ran in 2m 48s
Total Job Run Time: 3m 27s