Fixes #1796 by using a constant file name

When creating a file inside `intermediateOutputPath` the file name must be constant.
When creating a file inside `TempPath` the file name must or should be random.

Author: batzen

src/GitVersionTask/FileHelper.cs

@@ -156,12 +156,12 @@ public static FileWriteInfo GetFileWriteInfo(this string intermediateOutputPath,
 
             if (intermediateOutputPath == null)
             {
-                fileName = $"{outputFileName}.g.{fileExtension}";
+                fileName = $"{outputFileName}_{Path.GetFileNameWithoutExtension(projectFile)}_{Path.GetRandomFileName()}.g.{fileExtension}";
                 workingDirectory = TempPath;
             }
             else
             {
-                fileName = $"{outputFileName}_{Path.GetFileNameWithoutExtension(projectFile)}_{Path.GetRandomFileName()}.g.{fileExtension}";
+                fileName = $"{outputFileName}.g.{fileExtension}";
                 workingDirectory = intermediateOutputPath;
             }
             return new FileWriteInfo(workingDirectory, fileName, fileExtension);