Reworked DrawCommandTest.DeferredContexts test to call FinishFrame from worker threads (essential for Metal)
Reworked DrawCommandTest.DeferredContexts test to call FinishFrame from worker threads (essential for Metal)

DiligentGraphics/DiligentCore,DiligentGraphics/DiligentCore,DiligentGraphics/DiligentCore,DiligentGraphics/DiligentCore