Add a testsuite called gsk-compare-vulkan to run
the gsk renderer tests with the Vulkan renderer.
The current stats:
Ok: 184
Expected Fail: 0
Fail: 204
Unexpected Pass: 0
Skipped: 2
Timeout: 0
For now, we mark all the tests as failing to
avoid ci breakage. To run the tests locally,
you can do:
meson test -C_build --suite gsk-compare-vulkan