[Telemetry] Remove prodaccess check in cloud_storage.
[Telemetry] Remove prodaccess check in cloud_storage.

Rationale: this check is done by grepping 'prodacess' in gsutil script,
which is no longer apply for newer version of gsutil.

This is part of https://codereview.chromium.org/1260083007/

BUG=508721

Review URL: https://codereview.chromium.org/1264013002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#341460}

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