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Fix tracing delegate browser tests to use proto output.
Re enable tests with closed, archived or very old bugs, to see if it
is still flaky.

Fix trace event data source to not expect perfetto to wait for
stop acks.

The experiment configs are updated to disable this experiment where
needed, the system will upload traces to uma service by default
instead of JSON.

Change-Id: Id3acb1aa3cdedbcd07c41e18fd0bc66a3cdc1129
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2088213
Commit-Queue: ssid <ssid@chromium.org>
Reviewed-by: oysteine <oysteine@chromium.org>
Reviewed-by: Alexander Yashkin <a-v-y@yandex-team.ru>
Cr-Commit-Position: refs/heads/master@{#749278}