Bigtable/ClientSideMetrics Bigtable/ClientSideMetricsToMetricsHandler: should send the metrics to the metrics handler for a ReadRows call failed

[flaky-bot]

This test failed!

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commit: 6cb7cdd
buildURL: Build Status, Sponge
status: failed

[flaky-bot]

Looks like this issue is flaky. 😟

I'm going to leave this open and stop commenting.

A human should fix and close this.

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When run at the same commit (6cb7cdd), this test passed in one build (Build Status, Sponge) and failed in another build (Build Status, Sponge).