chromeperf: Support legacy test names
chromeperf: Support legacy test names

An inadvertent renaming of the keys for the synthesized test names
(those that have suffixes for stats) meant we greatly reduced the
amount of anomaly detection we were doing. While we should stop storing
those legacy stats, we should still support the legacy paths until we're
ready to support the stats defined in the subscription when performing
anomaly detection.

R=f07c55753dac44d78e0294a1d64ea321baaa78f4@google.com, fancl@chromium.org

Bug: chromium:1158326
Change-Id: Ieed35b0b54990d4bb47f601eff206e0e6292a6ad
Reviewed-on: https://chromium-review.googlesource.com/c/catapult/+/2637116
Auto-Submit: Dean Berris <34a37f59e4ade3cf49221306f04217acf3e86255@chromium.org>
Commit-Queue: Andrew Bennetts <f07c55753dac44d78e0294a1d64ea321baaa78f4@google.com>
Reviewed-by: Andrew Bennetts <f07c55753dac44d78e0294a1d64ea321baaa78f4@google.com>

catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult