[WebGPU] Disable URP Depth Priming for WebGPU

https://jira.unity3d.com/browse/PLATGRAPH-3470
On Apple Arm64 (M1+) GPUs, depth priming causes significant rendering artifacts for web builds. WebGL had this same issue and disabled Depth Priming support. We should disable Depth Priming support for WebGPU as well. Depth Priming can actually hurt performance on tile based GPUs like mobile, and we don't know what type of GPU you're running on with the web player. It seems reasonable to just disable support all-together for the web.

Author: brendan-duncan

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

@@ -571,7 +571,7 @@ bool IsDepthPrimingEnabled(UniversalCameraData cameraData)
             if (!CanCopyDepth(cameraData))
                 return false;
 
-            // Depth Priming causes rendering errors with WebGL on Apple Arm64 GPUs.
+            // Depth Priming causes rendering errors with WebGL and WebGPU on Apple Arm64 GPUs.
             bool isNotWebGL = !IsWebGL();
             bool depthPrimingRequested = (m_DepthPrimingRecommended && m_DepthPrimingMode == DepthPrimingMode.Auto) || m_DepthPrimingMode == DepthPrimingMode.Forced;
             bool isForwardRenderingMode = m_RenderingMode == RenderingMode.Forward || m_RenderingMode == RenderingMode.ForwardPlus;
@@ -586,8 +586,9 @@ bool IsDepthPrimingEnabled(UniversalCameraData cameraData)
 
         bool IsWebGL()
         {
+            // Both WebGL and WebGPU have issues with depth priming on Apple Arm64
 #if PLATFORM_WEBGL
-            return IsGLESDevice();
+            return true;
 #else
             return false;
 #endif