vulkancts: disable all nontransvis dg2 tests
These tests are numerous, flaky, and impossible to filter with a simple subgroup. Transvis tests are reliable, non-transvis are not reliable.
The nontransvis tests represent exactly half of the dEQP-VK.memory_model.transitive subgroup, but are differentiated at the lowest level of the deqp trie, where transvis/nontranvis tests are paired as leaf nodes (test cases) under the permutation of all the atomic/fence/local/nonlocal/buffer/image/etc characteristics at higher levels.