ci: Allow namespacing of dEQP run results files.

I want to do multiple runs of some bits of the CTS in one test job to test
some driver options, but I want to be able to see the results from any of
them.

Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4621>
1 file changed