Now, flakes that aren't in the *-flakes.txt get a "NEW" in their report so
I can watch for them.
The bash was unwieldy and made debugging hard, so I switched to python.
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11020>
