updating TaskVine parser to support version 2

Author: rafaelfsilva

wfcommons/wfinstances/logs/taskvine.py

@@ -228,7 +228,7 @@ def _construct_task_input_output_files(self) -> None:
 
         with open(self.taskgraph_file) as f:
             for line in f:
-                if line[0] == "#":
+                if line.startswith("#"):
                     continue
 
                 if line.startswith("TASK"):