Tests for VK_EXT_mesh_shader

Tests for VK_EXT_mesh_shader

This commits adds many new tests for the extension in different groups,
and also adds a few extra tests for VK_NV_mesh_shader.

Affected tests:
dEQP-VK.binding_model.descriptorset_random.*
dEQP-VK.subgroups.*
dEQP-VK.fragment_shading_rate.*.basic.*
dEQP-VK.dynamic_state.*
dEQP-VK.pipeline.extended_dynamic_state.*
dEQP-VK.glsl.atomic_operations.*
dEQP-VK.ycbcr.*

New NV tests:
dEQP-VK.mesh_shader.nv.smoke.fullscreen_gradient*
dEQP-VK.mesh_shader.nv.misc.mixed_pipelines
dEQP-VK.mesh_shader.nv.builtin.primitive_shading_rate*

New EXT tests:
dEQP-VK.mesh_shader.ext.*
dEQP-VK.binding_model.descriptorset_random.*.task.*
dEQP-VK.binding_model.descriptorset_random.*.mesh.*
dEQP-VK.subgroups.*mesh*
dEQP-VK.fragment_shading_rate.*.basic.*.ms
dEQP-VK.dynamic_state.* (mesh shader variants)
dEQP-VK.pipeline.extended_dynamic_state.mesh_shader.*
dEQP-VK.pipeline.extended_dynamic_state.*_bind_unused_ms
dEQP-VK.pipeline.extended_dynamic_state.*.prim_restart_* (mesh shader variants)
dEQP-VK.glsl.atomic_operations.*mesh*
dEQP-VK.glsl.atomic_operations.*task*
dEQP-VK.ycbcr.*.task.*
dEQP-VK.ycbcr.*.mesh.*

Components: Framework, Vulkan
VK-GL-CTS issue: 2991

Change-Id: I578b4e0022cee677db76780450d5f2479fb8a8cf