ci: Support per-driver skip lists.
In addition to a global skip list introduced in !11333 (merged) (enabled by https://gitlab.freedesktop.org/anholt/deqp-runner/-/merge_requests/4) it is also useful to have a per-driver skip list in addition to a per-gpu list. Now, there are multiple levels at which skips can be specified, from least to most specific,
- (deqp|piglit)-all-skips.txt :: affecting all tests
- (deqp|piglit)-$(DRIVER_NAME|VK_DRIVER|GALLIUM_DRIVER)-skips.txt :: affecting the specified driver
- (deqp|piglit)-$GPU_VERSION-skips.txt :: affecting a specific GPU
This idea could be useful for -fails.txt as well.
Edited by Charlie Turner