Fix T56372: Properly show error messages when submission fails

This also introduces a word-wrapping function that takes variable character
widths into account.

benchmark/space/global_state.py

@@ -1,4 +1,5 @@
 import threading
+import typing
 
 
 class G:
@@ -19,6 +20,8 @@ class G:
     current_progress = 0.0
     progress_lock = threading.Lock()
 
+    submission_exception: typing.Optional[Exception] = None
+
     @classmethod
     def reset(cls):
         """Reset the global state."""
@@ -29,3 +32,4 @@ class G:
         cls.background_image_path = ""
         cls.scene_status = {}
         cls.results_submitted = False
+        cls.submission_exception = None