refactor: remove bootstrapper from headless scene

because RD bootstrapper was refactored into a scriptableobject that boots before any scene.

Assets/Tests/HeadlessBootstrapScene.unity

@@ -132,7 +132,6 @@ GameObject:
   serializedVersion: 6
   m_Component:
   - component: {fileID: 184716088}
-  - component: {fileID: 184716087}
   m_Layer: 0
   m_Name: Bootstrapper
   m_TagString: Untagged
@@ -140,18 +139,6 @@ GameObject:
   m_NavMeshLayer: 0
   m_StaticEditorFlags: 0
   m_IsActive: 1
---- !u!114 &184716087
-MonoBehaviour:
-  m_ObjectHideFlags: 0
-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
-  m_GameObject: {fileID: 184716086}
-  m_Enabled: 1
-  m_EditorHideFlags: 0
-  m_Script: {fileID: 11500000, guid: fa61eabca29ec274e822d94f50702a99, type: 3}
-  m_Name: 
-  m_EditorClassIdentifier: 
 --- !u!4 &184716088
 Transform:
   m_ObjectHideFlags: 0

Assets/Tests/Raindrop/RaindropIntegrationTests/Helpers/SceneLoader.cs

@@ -21,12 +21,6 @@ namespace Raindrop.Tests.RaindropIntegrationTests.Helpers
                 yield return null;
             }
 
-            var bootstrap = GameObject.Find("Bootstrapper");
-            Assert.True(bootstrap, "bootstrapper object not found");
-            var raindropBootstrapper = 
-                bootstrap.GetComponent<RaindropBootstrapper>();
-            Assert.True(raindropBootstrapper);
-
             var instance = RaindropInstance.GlobalInstance;
             Assert.True(instance != null);
         }