Add ShaderVariables.hlsl to the procedural sky shader

ScriptableRenderPipeline/HDRenderPipeline/Sky/ProceduralSky/Resources/AtmosphericScattering.hlsl

 uniform float       _MiePhaseAnisotropy;
 uniform float       _MieExtinctionFactor;
 
-SAMPLER2D(sampler_MainDepthTexture);
-TEXTURE2D_FLOAT(_MainDepthTexture);
 TEXTURE2D(_OcclusionTexture);
 
 float HenyeyGreensteinPhase(float g, float cosTheta) {
 
 void VolundTransferScatter(float3 worldPos, out float4 coords1, out float4 coords2, out float4 coords3) {
     const float3 scaledWorldPos = WorldScale(worldPos);
-    const float3 worldCamPos = WorldScale(_CameraPosWS.xyz);
+    const float3 worldCamPos = WorldScale(_WorldSpaceCameraPos.xyz);
 
     const float c_MieScaleHeight = 1200.f;
     const float worldRayleighDensity = 1.f;
     const float worldVecLen = length(worldVec);
     const float3 worldDir = worldVec / worldVecLen;
 
-    const float3 worldDirUnscaled = normalize(worldPos - _CameraPosWS.xyz);
+    const float3 worldDirUnscaled = normalize(worldPos - _WorldSpaceCameraPos.xyz);
 
     const float viewSunCos = dot(worldDirUnscaled, _SunDirection);
     const float rayleighPh = min(1.f, RayleighPhase(viewSunCos) * 12.f);

ScriptableRenderPipeline/HDRenderPipeline/Sky/ProceduralSky/Resources/SkyProcedural.shader

             #pragma multi_compile _ ATMOSPHERICS_DEBUG
             #pragma multi_compile _ PERFORM_SKY_OCCLUSION_TEST
 
-            #include "../../../ShaderConfig.cs.hlsl"
+            #include "../../../ShaderVariables.hlsl"
-            // x exposure, y multiplier, z rotation
-            float4 _SkyParam;
-
-            // x = width, y = height, z = 1.0/width, w = 1.0/height
-            float4 _ScreenSize;
-
-            float4 _CameraPosWS;
-
-            float4x4 _InvViewProjMatrix;
-
-            float _SkyDepth;
-
-            float _DisableSkyOcclusionTest;
+            // x exposure, y multiplier, z rotation
+            float4   _SkyParam;
+            float    _SkyDepth;
+            float    _DisableSkyOcclusionTest;
-
 
             struct Attributes
             {
                 Varyings output;
                 output.positionCS = GetFullScreenTriangleVertexPosition(input.vertexID, UNITY_RAW_FAR_CLIP_VALUE);
                 return output;
-            }
-
-            float3 GetAbsolutePositionWS(float3 cameraRelativePositionWS)
-            {
-                float3 pos = cameraRelativePositionWS;
-            #if (SHADEROPTIONS_CAMERA_RELATIVE_RENDERING != 0)
-                pos += _CameraPosWS;
-            #endif
-                return pos;
             }
 
             float4 Frag(Varyings input) : SV_Target