Expose the ability to control manipulator line bounds (#3890)

Signed-off-by: hultonha <hultonha@amazon.co.uk>

Code/Framework/AzManipulatorTestFramework/Source/ViewportInteraction.cpp

@@ -62,6 +62,11 @@ namespace AzManipulatorTestFramework
         return m_angularStep;
     }
 
+    float ViewportInteraction::ManipulatorLineBoundWidth()
+    {
+        return 0.1f;
+    }
+
     AzFramework::ScreenPoint ViewportInteraction::ViewportWorldToScreen(const AZ::Vector3& worldPosition)
     {
         return AzFramework::WorldToScreen(worldPosition, m_cameraState);