tests: Move HLSL tests to a subdirectory.

Approved-by: Giovanni Mascellani (@giomasce)
Approved-by: Francisco Casas (@fcasas)
Approved-by: Henri Verbeet (@hverbeet)
Approved-by: Alexandre Julliard (@julliard)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/248

tests/hlsl/cross.shader_test

@@ -0,0 +1,28 @@
+[pixel shader]
+float4 main(uniform float4 u, uniform float4 v) : sv_target
+{
+    float4 res = float4(0, 0, 0, 0);
+    res.xyz = cross(u, v);
+    return res;
+}
+
+[test]
+uniform 0 float4 1 -2 3 4
+uniform 4 float4 10 100 1000 10000
+draw quad
+probe all rgba (-2300, -970, 120, 0)
+
+
+
+[pixel shader]
+float4 main(uniform float4 u) : sv_target
+{
+    float4 res = float4(0, 0, 0, 3.5);
+    res.xyz = cross(u, 4);
+    return res;
+}
+
+[test]
+uniform 0 float4 1 -2 3 4
+draw quad
+probe all rgba (-20, 8, 12, 3.5)