Use the new combiners functions added in an earlier CL. Makes it easy
to maintain bigger lists of test combinations.

Also a few other changes:

 - removes some D3D9 perf testing since we don't maintain this config
 - removes the "validation only" tests. these were mostly redundant
 - makes the tests permutation combinations more consistent

Bug: angleproject:3630
Change-Id: I175d887a01b21123f83f9fa4f64dacaa2644147a
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2059468Reviewed-by: Cody Northrop <cnorthrop@google.com>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>