Report correct shared examples location

This fix makes the JSON formatter report the path the spec file that
includes the shared examples. The line number is the line in that
spec file that refers to the shared examples.

qa/qa/support/json_formatter.rb

@@ -35,13 +35,15 @@ module QA
       private
 
       def format_example(example)
+        file_path, line_number = location_including_shared_examples(example.metadata)
+
         {
           id: example.id,
           description: example.description,
           full_description: example.full_description,
           status: example.execution_result.status.to_s,
-          file_path: example.metadata[:file_path],
-          line_number: example.metadata[:line_number],
+          file_path: file_path,
+          line_number: line_number.to_i,
           run_time: example.execution_result.run_time,
           pending_message: example.execution_result.pending_message,
           status_issue: example.metadata[:status_issue],
@@ -49,6 +51,15 @@ module QA
           screenshot: example.metadata[:screenshot]
         }
       end
+
+      def location_including_shared_examples(metadata)
+        if metadata[:shared_group_inclusion_backtrace].empty?
+          [metadata[:file_path], metadata[:line_number]]
+        else
+          # If there are nested shared examples, the outermost location is last in the array
+          metadata[:shared_group_inclusion_backtrace].last.formatted_inclusion_location.split(':')
+        end
+      end
     end
   end
 end