save the list of new model failures

[ydshieh]

What does this PR do?

We finally get back the missing new model failure table and list on slack channels, but those are truncated version.
We have the full table saved as artifact, but not the list. This PR saves the full list of new model failures as artifact too, so we can access the information outside slack.

This is particularly useful when a CI run has many new failures.

table: (just some numbers)

Changed model modules failures:

Single PT |  Multi PT | Single TF |  Multi TF |     Other | Category
        0 |         0 |         0 |         0 |        +7 | fsdp
        0 |         0 |         0 |         0 |        +1 | models_cohere
        0 |       +22 |         0 |        +1 |         0 | models_deit

list: (has the test names and job links)

<https://github.com/huggingface/transformers/actions/runs/9194245573/job/25287588257|multi> gpu
tests/fsdp/test_fsdp.py::TrainerIntegrationFSDP::test_basic_run_full_shard_bf16

<https://github.com/huggingface/transformers/actions/runs/9194245573/job/25287588257|multi> gpu
tests/fsdp/test_fsdp.py::TrainerIntegrationFSDP::test_basic_run_shard_grad_op_bf16

[amyeroberts]

Thanks for adding!

[HuggingFaceDocBuilderDev]

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