Disable unstable Materials test

Author: AngelaDematte

Tests/SRPTests/Projects/HDRP_RuntimeTests/Assets/Tests/HDRP_Runtime_Graphics_Tests.cs

@@ -83,6 +83,11 @@ public void SetDefaultResolution()
         graphicsDeviceTypes: new GraphicsDeviceType[] { GraphicsDeviceType.Metal },
         architectures: new Architecture[] { Architecture.X64 }
     )]
+    [IgnoreGraphicsTest(
+        "010-BRG-Simple",
+        "Unstable: https://jira.unity3d.com/browse/UUM-134572",
+        runtimePlatforms: new RuntimePlatform[] { RuntimePlatform.PS5 }
+    )]
     [IgnoreGraphicsTest(
         "012-SVL_Check$",
         "https://jira.unity3d.com/browse/UUM-70791",