Fix Regression in GLCore from GH #7029 (#7062)

* Fix Regression in GLCore from GH #7029

The changes in GH #7029 accidentally broke the platform shader macro
override system for GLCore's texture cube arrays. This change fixes
the issue by restoring the missing platform macros.

* Fall Back to UNITY_NO_CUBEMAP_ARRAY Due to Bug

Due to some sort of bug, SHADER_AVAILABLE_CUBEARRAY is not defined in
compute shaders. This commit switches the code back to
UNITY_NO_CUBEMAP_ARRAY to avoid futher problems.

(FogBugz Case 1402457)

* Fix Comment Typo

* Revert UNITY_NO_CUBEMAP_ARRAY Changes

This change removes usage of UNITY_NO_CUBEMAP_ARRAY and replaces it with
SHADER_AVAILABLE_CUBEARRAY since that's the correct macro to be using.
The bug we encountered after this change in VFX was actually due to a
missing pragma: "#pragma require cubearray".

Author: gmitrano-unity

com.unity.render-pipelines.core/ShaderLibrary/API/GLCore.hlsl

@@ -109,13 +109,13 @@
 #define PLATFORM_SAMPLE_TEXTURECUBE_BIAS(textureName, samplerName, coord3, bias)                  textureName.SampleBias(samplerName, coord3, bias)
 
 #if SHADER_AVAILABLE_CUBEARRAY
-#define SAMPLE_TEXTURECUBE_ARRAY(textureName, samplerName, coord3, index)                         textureName.Sample(samplerName, float4(coord3, index))
-#define SAMPLE_TEXTURECUBE_ARRAY_LOD(textureName, samplerName, coord3, index, lod)                textureName.SampleLevel(samplerName, float4(coord3, index), lod)
-#define SAMPLE_TEXTURECUBE_ARRAY_BIAS(textureName, samplerName, coord3, index, bias)              textureName.SampleBias(samplerName, float4(coord3, index), bias)
+#define PLATFORM_SAMPLE_TEXTURECUBE_ARRAY(textureName, samplerName, coord3, index)                textureName.Sample(samplerName, float4(coord3, index))
+#define PLATFORM_SAMPLE_TEXTURECUBE_ARRAY_LOD(textureName, samplerName, coord3, index, lod)       textureName.SampleLevel(samplerName, float4(coord3, index), lod)
+#define PLATFORM_SAMPLE_TEXTURECUBE_ARRAY_BIAS(textureName, samplerName, coord3, index, bias)     textureName.SampleBias(samplerName, float4(coord3, index), bias)
 #else
-#define SAMPLE_TEXTURECUBE_ARRAY(textureName, samplerName, coord3, index)                         ERROR_ON_UNSUPPORTED_FUNCTION(SAMPLE_TEXTURECUBE_ARRAY)
-#define SAMPLE_TEXTURECUBE_ARRAY_LOD(textureName, samplerName, coord3, index, lod)                ERROR_ON_UNSUPPORTED_FUNCTION(SAMPLE_TEXTURECUBE_ARRAY_LOD)
-#define SAMPLE_TEXTURECUBE_ARRAY_BIAS(textureName, samplerName, coord3, index, bias)              ERROR_ON_UNSUPPORTED_FUNCTION(SAMPLE_TEXTURECUBE_ARRAY_BIAS)
+#define PLATFORM_SAMPLE_TEXTURECUBE_ARRAY(textureName, samplerName, coord3, index)                ERROR_ON_UNSUPPORTED_FUNCTION(SAMPLE_TEXTURECUBE_ARRAY)
+#define PLATFORM_SAMPLE_TEXTURECUBE_ARRAY_LOD(textureName, samplerName, coord3, index, lod)       ERROR_ON_UNSUPPORTED_FUNCTION(SAMPLE_TEXTURECUBE_ARRAY_LOD)
+#define PLATFORM_SAMPLE_TEXTURECUBE_ARRAY_BIAS(textureName, samplerName, coord3, index, bias)     ERROR_ON_UNSUPPORTED_FUNCTION(SAMPLE_TEXTURECUBE_ARRAY_BIAS)
 #endif
 
 #define PLATFORM_SAMPLE_TEXTURE3D(textureName, samplerName, coord3)                               textureName.Sample(samplerName, coord3)