refactor: remove unused _NORMALMAP and VERSION_LOWER keywords for URP

[sindharta]

No description provided.

[Copilot]

Pull request overview

This PR removes the _NORMALMAP shader keyword from Unity Toon Shader files, simplifying the shader code by eliminating conditional compilation paths related to normal mapping. The changes also remove version-specific compatibility checks for older Unity versions.

Key Changes:

• Removed _NORMALMAP shader feature declarations from shader templates and generated shaders
• Simplified HLSL code by removing _NORMALMAP conditional blocks and related vertex light handling
• Cleaned up version-specific compatibility code (VERSION_LOWER checks)

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
UniversalToonBodyShadingGradeMap.hlsl	Removed _NORMALMAP conditional block and version checks, simplified input data initialization
UniversalToonBodyDoubleShadeWithFeather.hlsl	Removed _NORMALMAP conditional block and version checks, simplified input data initialization
UnityToonTessellation.shadertemplate	Removed _NORMALMAP shader feature declaration
UnityToon.shadertemplate	Removed _NORMALMAP shader feature declaration
UnityToonTessellation.shader	Removed _NORMALMAP shader feature and updated auto-generation timestamp
UnityToon.shader	Removed _NORMALMAP shader feature and updated auto-generation timestamp

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