Also call DetectUnityVersion when in UnityTasks.UnityRunTests

The generic PreProcess method on line 111 also handles Unity runs that don't directly relate to a project (e.g. license activation). However, for the tasks which deal with projects, we want them to auto-detect the Unity editor version from the project. Previously this was only implemented when starting the general UnityTasks.Unity method, but now it's also used when running tests.

source/Nuke.Common/Tools/Unity/UnityTasks.cs

@@ -63,15 +63,27 @@ private static string GetProgramFiles()
     }
 
     private static void PreProcess(ref UnitySettings unitySettings)
+    {
+        var projectSettings = (UnityProjectSettings)unitySettings;
+        PreProcessWithAutoDetect(ref projectSettings);
+    }
+
+    private static void PreProcess(ref UnityRunTestsSettings unitySettings)
+    {
+        var projectSettings = (UnityProjectSettings)unitySettings;
+        PreProcessWithAutoDetect(ref projectSettings);
+    }
+
+    private static void PreProcessWithAutoDetect(ref UnityProjectSettings unitySettings)
     {
         if (unitySettings.ProjectPath == null)
             Log.Warning("ProjectPath is not set, using last opened/built project");
 
         DetectUnityVersion(ref unitySettings);
-        PreProcess<UnitySettings>(ref unitySettings);
+        PreProcess(ref unitySettings);
     }
 
-    private static void DetectUnityVersion(ref UnitySettings unitySettings)
+    private static void DetectUnityVersion(ref UnityProjectSettings unitySettings)
     {
         if (unitySettings.HubVersion != null ||
             unitySettings.ProjectPath == null)