In several cases synchronization issues around discarded resources could lead
to crashes. These crashes where more prominent on NVIDIA as they reuse
their handles more often.
This PR requires external synchronization when data is moved from a
discard pool to the main orphaned data discard pool. Also the device
timeline should be guarded by the same mutex.
Pull Request: https://projects.blender.org/blender/blender/pulls/140274
38a8512e47