Provide more task info during test failures

We're trying to debug a test failure in the CI that we can't
reproduce locally:

https://github.com/pulp/pulp_deb/actions/runs/9898615528/job/27345874499?pr=1061#step:15:3505

Part of the challenge in debugging this is that there's not enough
information to go on because the CI is only outputting the task error
description. Not sure if there's a better way to handle this but in
these cases it seems like printing the entire task details somehow would
be more helpful.

[noissue]

pulpcore/tests/functional/utils.py

@@ -28,7 +28,7 @@ class PulpTaskError(Exception):
 
         def __init__(self, task):
             """Provide task info to exception."""
-            description = task.to_dict()["error"].get("description")
+            description = task.to_dict()
             super().__init__(self, f"Pulp task failed ({description})")
             self.task = task