Improve exception parsing

[Delaunay]

No description provided.

[Delaunay]

Example with the newest parsing:

opt-1_3b.local
==============
  * Error code = 1
  * 9 exceptions found
    * 7 x ModuleNotFoundError: No module named 'datasets'
    * 1 x [2024-06-14 11:36:40,300] torch.distributed.elastic.multiprocessing.api: [ERROR] failed (exitcode: 1) local_rank: 0 (pid: 1078640) of binary: /milabench/milabench_venv/bin/python
    * 1 x torch.distributed.elastic.multiprocessing.errors.

opt-1_3b.local
==============
  * Error code = 1
  * 9 exceptions found
    * 7 x ModuleNotFoundError: No module named 'datasets'
        | Traceback (most recent call last):
        |   File "/milabench/benchmarks/accelerate_opt/main.py", line 72, in <module>
        |     import datasets
        | ModuleNotFoundError: No module named 'datasets'
    * 1 x [2024-06-14 11:36:40,300] torch.distributed.elastic.multiprocessing.api: [ERROR] failed (exitcode: 1) local_rank: 0 (pid: 1078640) of binary: /milabench/milabench_venv/bin/python
        | Traceback (most recent call last):
        |   File "/milabench/benchmarks/accelerate_opt/main.py", line 72, in <module>
        |     import datasets
        | ModuleNotFoundError: No module named 'datasets'
        | [2024-06-14 11:36:40,300] torch.distributed.elastic.multiprocessing.api: [ERROR] failed (exitcode: 1) local_rank: 0 (pid: 1078640) of binary: /milabench/milabench_venv/bin/python
    * 1 x torch.distributed.elastic.multiprocessing.errors.
        | Traceback (most recent call last):
        |   File "/milabench/milabench_venv/bin/accelerate", line 8, in <module>
        |     sys.exit(main())
        |              ^^^^^^
        |   File "/milabench/milabench_venv/lib/python3.11/site-packages/accelerate/commands/accelerate_cli.py", line 48, in main
        |     args.func(args)
        |   File "/milabench/milabench_venv/lib/python3.11/site-packages/accelerate/commands/launch.py", line 1088, in launch_command
        |     multi_gpu_launcher(args)
        |   File "/milabench/milabench_venv/lib/python3.11/site-packages/accelerate/commands/launch.py", line 733, in multi_gpu_launcher
        |     distrib_run.run(args)
        |   File "/milabench/milabench_venv/lib/python3.11/site-packages/torch/distributed/run.py", line 797, in run
        |     elastic_launch(
        |   File "/milabench/milabench_venv/lib/python3.11/site-packages/torch/distributed/launcher/api.py", line 134, in __call__
        |     return launch_agent(self._config, self._entrypoint, list(args))
        |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        |   File "/milabench/milabench_venv/lib/python3.11/site-packages/torch/distributed/launcher/api.py", line 264, in launch_agent
        |     raise ChildFailedError(
        | torch.distributed.elastic.multiprocessing.errors.
        | ChildFailedError: