[2023.3][URP] Fixing an issue with Alpha clipping and Depth Priming (UUM-64447)

Fixes UUM-64447.
The issue was that the `_ALPHATEST_ON` keyword needs to be available in both vertex and fragment shaders in order to check if UV (TEXCOORD1) is needed or not.

Author: ellioman

Packages/com.unity.render-pipelines.universal/Shaders/ComplexLit.shader

@@ -379,7 +379,7 @@ Shader "Universal Render Pipeline/Complex Lit"
             #pragma shader_feature_local _NORMALMAP
             #pragma shader_feature_local _PARALLAXMAP
             #pragma shader_feature_local _ _DETAIL_MULX2 _DETAIL_SCALED
-            #pragma shader_feature_local_fragment _ALPHATEST_ON
+            #pragma shader_feature_local _ALPHATEST_ON
             #pragma shader_feature_local_fragment _SMOOTHNESS_TEXTURE_ALBEDO_CHANNEL_A
 
             // -------------------------------------

Packages/com.unity.render-pipelines.universal/Shaders/Lit.shader

@@ -376,7 +376,7 @@ Shader "Universal Render Pipeline/Lit"
             #pragma shader_feature_local _NORMALMAP
             #pragma shader_feature_local _PARALLAXMAP
             #pragma shader_feature_local _ _DETAIL_MULX2 _DETAIL_SCALED
-            #pragma shader_feature_local_fragment _ALPHATEST_ON
+            #pragma shader_feature_local _ALPHATEST_ON
             #pragma shader_feature_local_fragment _SMOOTHNESS_TEXTURE_ALBEDO_CHANNEL_A
 
             // -------------------------------------

Packages/com.unity.render-pipelines.universal/Shaders/SimpleLit.shader

@@ -334,7 +334,7 @@ Shader "Universal Render Pipeline/Simple Lit"
             // -------------------------------------
             // Material Keywords
             #pragma shader_feature_local _NORMALMAP
-            #pragma shader_feature_local_fragment _ALPHATEST_ON
+            #pragma shader_feature_local _ALPHATEST_ON
             #pragma shader_feature_local_fragment _GLOSSINESS_FROM_BASE_ALPHA
 
             // -------------------------------------