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Re-enables the Telemetry minidump tests on most platforms. They were
disabled due to flakiness, but further investigation shows that the
flake rate was relatively low, and some flakes were caused by unrelated
issues, e.g. platform-wide issues.

Bug: 1084931
Change-Id: I31fab19af04faea49826dc827a45817da3de9397
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2318505
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791977}