Spanner: Simplify and unflake SpannerGaxRetryTest #6163
Merged
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Fixes the flake from this build: https://source.cloud.google.com/results/invocations/e06a185f-0e72-4e5d-a914-29944231d7af/targets/cloud-devrel%2Fclient-libraries%2Fjava%2Fgoogle-cloud-java%2Fpresubmit%2Fjava8-win/log
Also cleans up, speeds up and simplifies the test case and removes some unused code.