ci: Disable a bunch of tests on freedreno a630.

ci: Disable a bunch of tests on freedreno a630.

On a daily basis I've been having to restart people's a630 jobs in the
front couple of pages of /merge_requests due to spurious failures from our
flaky tests, and fielding reports of spurious fails from other developers,
and babysitting my own marge merges that are failing due to our flakes.

Nobody should have to deal with that, especially not non-freedreno
developers, so just scrape the list of flakes reported to #freedreno-ci
for the last month and ban those tests that have failed more than once
until we have a credible fix.

Acked-by: Kristian H. Kristensen <hoegsberg@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3662>