This adds a piglit runner that we'll be using on freedreno, better
xfail/unexpectedpass handling for some cases (Missing->Pass, Warn->Warn),
better error logging for the Missing issue we've had in CI, a fix for a
source of Missing, and a pile more unit tests.
As a result, we now catch that the Missing results for a bunch of our
tests have gone away.
Reviewed-by: Juan A. Suarez Romero <jasuarez@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9468>
0b4691d615