Enable validation for all custom devices

Enable validation for all custom devices

This commit changes some tests that use custom devices so they rely on
the custom device helper functions to create these custom devices with
the validation layers enabled if requested from the command line.

In addition, some "createDevice" functions are renamed so a simple
search for "createDevice" only reports uses of the createDevice instance
interface method and RefUtil helper function.

The affected tests should only behave differently with validation
enabled. Running these tests without validation should not result in any
changes.

Affected tests:
dEQP-VK.api.buffer_marker.*
dEQP-VK.api.info.vulkan1p2.feature_bits_influence
dEQP-VK.draw.concurrent.compute_and_triangle_list
dEQP-VK.ray_tracing_pipeline.capture_replay.*
dEQP-VK.synchronization*.signal_order.*
dEQP-VK.synchronization.timeline_semaphore.*
dEQP-VK.synchronization2.timeline_semaphore.*

Components: Vulkan
VK-GL-CTS issue: 2835

Change-Id: I6e8028428faa69d92ab9a8a0e8ba25540d04810f