Added Opaque Cull Mode option for materials and ShaderGraph

TestProjects/HDRP_Tests/Assets/GraphicTests/Scenes/8x_ShaderGraph/8101_Opaque/BI_DS_Enabled.mat

@@ -189,6 +189,7 @@ Material:
     - _Metallic: 0.9
     - _NormalMapSpace: 0
     - _NormalScale: 1
+    - _OpaqueCullMode: 2
     - _PPDLodThreshold: 5
     - _PPDMaxSamples: 15
     - _PPDMinSamples: 5

TestProjects/HDRP_Tests/Assets/GraphicTests/Scenes/8x_ShaderGraph/8101_Opaque/BI_DS_MirroredSpec.mat

@@ -202,6 +202,7 @@ Material:
     - _Metallic: 0.5
     - _NormalMapSpace: 0
     - _NormalScale: 1
+    - _OpaqueCullMode: 2
     - _PPDLodThreshold: 5
     - _PPDMaxSamples: 15
     - _PPDMinSamples: 5

TestProjects/HDRP_Tests/Assets/GraphicTests/Scenes/8x_ShaderGraph/8101_Opaque/BI_GSAA.mat

@@ -189,6 +189,7 @@ Material:
     - _Metallic: 0.75
     - _NormalMapSpace: 0
     - _NormalScale: 0.25
+    - _OpaqueCullMode: 2
     - _PPDLodThreshold: 5
     - _PPDMaxSamples: 15
     - _PPDMinSamples: 5

TestProjects/HDRP_Tests/Assets/GraphicTests/Scenes/8x_ShaderGraph/8101_Opaque/FrontCulling.mat

@@ -0,0 +1,271 @@
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