ci: Rename the deqp/piglit-drivername-*.txt files to drivername-*.txt

Merged Emma Anholt requested to merge anholt/mesa:ci-filenames into main

We have two testsuites with the same format for fails/flakes/skips files, and test names that are definitely unique. As I'm about to add a third testsuite (gtest for libva-utils), so let's have just one file each for fails/flakes/skips instead of one per type of testsuite.


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