UUM-61466 Set depth format for cameras with motion vectors

JIRA: UUM-61466

When motion vectors are required and a depth-less offscreen texture is used as the camera target, a default depth format should be provided to motion vectors.

Author: patrickp-unity3d

Packages/com.unity.render-pipelines.universal/Runtime/UniversalRenderer.cs

@@ -1747,6 +1747,10 @@ void CreateCameraRenderTarget(ScriptableRenderContext context, ref RenderTexture
                     depthDescriptor.depthStencilFormat = k_DepthStencilFormat;
                     RenderingUtils.ReAllocateIfNeeded(ref m_CameraDepthAttachment, depthDescriptor, FilterMode.Point, TextureWrapMode.Clamp, name: "_CameraDepthAttachment");
                     cmd.SetGlobalTexture(m_CameraDepthAttachment.name, m_CameraDepthAttachment.nameID);
+
+                    // update the descriptor to match the depth attachment
+                    descriptor.depthStencilFormat = depthDescriptor.depthStencilFormat;
+                    descriptor.depthBufferBits = depthDescriptor.depthBufferBits;
                 }
             }