Switch DX12 pipeline creation to always use a stream descriptor

[inner-daemons]

Is your feature request related to a problem? Please describe.
The CreateGraphicsPipelineState function works great for basic render pipelines, but for more advanced features such as mesh shaders (#8110) or multiview/view instancing (#8206), you must use a streaming descriptor. The streaming descriptor corresponds more or less to a vulkan pipeline descriptor with the state described in a pNext chain, allowing you to use all sorts of extensions.

#8110 added mesh shaders to DX12 backend, so mesh shader pipeline creation currently goes through a stream descriptor. Moreover, the logic in this PR can be easily extended standard render pipeline fields. We should make all render pipeline creation use this.

#8206 is a prime example. Otherwise identical render pipelines that want to render to multiple textures would have to take a completely different code path. Keeping the existing code path alive provides no benefits.

Describe the solution you'd like
Use the render pipeline creation from #8110 or similar.

Describe alternatives you've considered
Keep doing what we're doing and ignore these features.

Additional context