Bugfix: Orthogonalize tangent basis, this fixes some cases of anisotropy not working correctly (would only show with normal maps on one extreme of anisotropy)

com.unity.render-pipelines.high-definition/HDRP/Material/StackLit/StackLitData.hlsl

     surfaceData.normalWS = SurfaceGradientResolveNormal(input.worldToTangent[2], gradient.xyz);
     surfaceData.coatNormalWS = SurfaceGradientResolveNormal(input.worldToTangent[2], coatGradient.xyz);
 
+    surfaceData.tangentWS = Orthonormalize(surfaceData.tangentWS, surfaceData.normalWS);
+
     if ((_GeometricNormalFilteringEnabled + _TextureNormalFilteringEnabled) > 0.0)
     {
         float geometricVariance = _GeometricNormalFilteringEnabled ? GeometricNormalVariance(input.worldToTangent[2], _SpecularAntiAliasingScreenSpaceVariance) : 0.0;