Instead of attempting to run numConfigs^2 test permutations in a single
test we now split up each config into its own test. Each permutation
also gets a unique name based on the configs it is testing. Because
there were so many tests on some back-ends (e.g. D3D11) this CL adds
a way to hard limit the number of test permutations by discarding
random tests to reach a specified maximum per back-end.

Uses the GoogleTest "RegisterTests" API instead of using the GTEST
macros. See online GTest docs for more info.

This will allow more easily supporting test timeouts when running
batches of tests multi-process.

As a side effect we no longer need to restrict this test to Release
builds or ignore some renderers.

Bug: angleproject:4449
Change-Id: Ia7991e2a3906175413b77a876432061da527d03b
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2050812
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>