Blender Git Loki

Fix T92472: OptiX denoising artifacts with recent GPU driver 495.29.05 or newer on Linux

Adds a workaround for a driver bug in r495 that causes artifacts with OptiX denoising.
`optixDenoiserSetup` is not working properly there when called with a stream other than the
default stream, so use the default stream for now and force synchronization across the entire
context afterwards to ensure the other stream Cycles uses to enqueue the actual denoising
command cannot execute before the denoising setup has finished.

Maniphest Tasks: T92472

Differential Revision: https://developer.blender.org/D13158