[VFX] Strip tangent not properly computed when using Shader Graph output

To compute the tangents for strips, we check the distances to previous and next particles, and obtain the direction.
When the particles are too close, the direction may not be representative, so we check that they are under a certain threshold.
The threshold used is good enough for distance but, since we are testing distances squared, it turns out to be to large.
This was already fixed for VFX graph generated shaders, but we missed the same code path for Shader Graph generated shaders.

Wrong
<img width="653" alt="image" src="https://media.github.cds.internal.unity3d.com/user/2805/files/cf2712ec-be64-4838-b362-adb0b380e117">

Right
<img width="584" alt="image" src="https://media.github.cds.internal.unity3d.com/user/2805/files/1324fa06-571e-4e8e-a51a-49cfbf70af39">

Packages/com.unity.visualeffectgraph/Editor/ShaderGraph/Templates/VFXConfig.template.hlsl

@@ -173,7 +173,7 @@ float3 GetStripTangent(float3 currentPos, uint instanceIndex, uint relativeIndex
         uint prevIndex = GetParticleIndex(relativeIndex - 1, stripData);
         float3 tangent = currentPos - GetParticlePosition(prevIndex, instanceIndex);
         float sqrLength = dot(tangent, tangent);
-        if (sqrLength > VFX_EPSILON)
+        if (sqrLength > VFX_EPSILON * VFX_EPSILON)
             prevTangent = tangent * rsqrt(sqrLength);
     }
 
@@ -183,7 +183,7 @@ float3 GetStripTangent(float3 currentPos, uint instanceIndex, uint relativeIndex
         uint nextIndex = GetParticleIndex(relativeIndex + 1, stripData);
         float3 tangent = GetParticlePosition(nextIndex, instanceIndex) - currentPos;
         float sqrLength = dot(tangent, tangent);
-        if (sqrLength > VFX_EPSILON)
+        if (sqrLength > VFX_EPSILON * VFX_EPSILON)
             nextTangent = tangent * rsqrt(sqrLength);
     }