webgpu: Move errorscopes to WGPU thread (#32304)

* Prepare errorscopes logic in wgpu_thread

* remove scope_id from ipc

* new GPUErrors per spec

* remove cotent timeline error_scope

* fixup poperrorscope types

* device_scope -> gpu_error and nice errors

* Handle errors detection more elegantly

* good expectations

* new expectations

* Make error_scope.errors Vec as per spec

components/script/dom/gpusampler.rs

@@ -88,7 +88,7 @@ impl Drop for GPUSampler {
         if let Err(e) = self
             .channel
             .0
-            .send((None, WebGPURequest::DropSampler(self.sampler.0)))
+            .send(WebGPURequest::DropSampler(self.sampler.0))
         {
             warn!("Failed to send DropSampler ({:?}) ({})", self.sampler.0, e);
         }