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Fixes the Telemetry minidump tests failing on Linux by switching from
GetMostRecentMinidumpPath() to GetRcentMinidumpPathWithTimeout(), i.e.
blocking until a minidump is actually available instead of assuming one
has been written to disk by the time we check for it.

This will also hopefully fix similar issues on other platforms, but for
now, Linux is the only platform that is being re-enabled.

Bug: 634156
Change-Id: I1a4bb9e8710b322e9a30c8b2040d6617bf1fc531
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1713749
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680090}