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This should help prevent flaky tests from landing in the tree.

Also includes a minor cleanup where the test suite keys in the entries
for ANGLE tests are sorted alphabetically.

Bug: angleproject:3029
Change-Id: I19420d3f716d44ded44db39b185aa947c06110f4
Reviewed-on: https://chromium-review.googlesource.com/c/1394795Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619750}