Tweaks to existing tests

Setup both particle tests(29 & 37) to work in the edit mode test

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Tests/GraphicsTests/RenderPipeline/LightweightPipeline/Scenes/029_Particles.unity

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Tests/GraphicsTests/RenderPipeline/LightweightPipeline/Scenes/036_Lighting_Scene_DirectionalBakedDirectional.unity

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Tests/GraphicsTests/RenderPipeline/LightweightPipeline/Scenes/037_Shader_StandardParticleShaders/Standard Particle Shader/Materials/2. Unlit Rendering Modes/2. ParticlesStandardUnlit - Camera Fading - Fade.mat

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     - _MetallicGlossMap:

Tests/GraphicsTests/RenderPipeline/LightweightPipeline/Scenes/037_Shader_StandardParticleShaders/Standard Particle Shader/Materials/Plane.mat

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     - _ZWrite: 1
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     - _EmissionColor: {r: 0, g: 0, b: 0, a: 0}
     - _SpecColor: {r: 1, g: 1, b: 1, a: 1}

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Tests/GraphicsTests/RenderPipeline/LightweightPipeline/Scenes/029_Particles/PlaySystems.cs

+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+[ExecuteInEditMode]
+public class PlaySystems : MonoBehaviour {
+
+    public ParticleSystem[] particleSystems;
+	[Range(0, 1)]
+    public float simPoint = 0.5f;
+    void OnEnable () {
+		foreach(ParticleSystem ps in particleSystems){
+            if (ps != null)
+            {
+                float life = ps.duration * simPoint;
+                ps.Simulate(life, true, true, false);
+            }
+        }
+	}
+
+	void OnDisable()
+    {
+        foreach (ParticleSystem ps in particleSystems)
+        {
+			if(ps != null)
+            	ps.Stop();
+        }
+    }
+}

Tests/GraphicsTests/RenderPipeline/LightweightPipeline/Scenes/029_Particles/PlaySystems.cs.meta

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