Skip failing JetMOE generation tests

[amyeroberts]

What does this PR do?

Two JetMOE generation tests started failing after the merge of #30536 - skipping them for now to make main happy again and avoid blocking PRs.

FAILED tests/models/jetmoe/test_modeling_jetmoe.py::JetMoeModelTest::test_beam_sample_generate - RuntimeError: cannot reshape tensor of 0 elements into shape [4, 0, 2, -1] because the unspecified dimension size -1 can be any value and is ambiguous
FAILED tests/models/jetmoe/test_modeling_jetmoe.py::JetMoeModelTest::test_generate_from_inputs_embeds_decoder_only - AssertionError: AssertionError not raised

Example run: https://app.circleci.com/pipelines/github/huggingface/transformers/94919/workflows/7b36e120-b4ce-45d4-ba80-15a681557e87/jobs/1247043

cc @ArthurZucker

[ydshieh]

Thanks for the quick fix!

[amyeroberts]

Merging as flax equivalence tests for BigBird is unrelated

[HuggingFaceDocBuilderDev]

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[ArthurZucker]

Thanks, FYI @gante and @zucchini-nlp . Pinging @Cyrilvallez in case he has time to work on a fix 😉 We should have checked if Jamba tests also pass since the arch is also a bit new / hybrid!

[Cyrilvallez]

Hi! Sorry about that, looking into it right now! Thanks @amyeroberts for noticing!