Fix failing MusicgenStereo integration tests

[Sai-Suraj-27]

What does this PR do?

Fixes these failing MusicgenStereoIntegrationTests

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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  Pull Request section?
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• Did you write any new necessary tests?

Who can review?

@Rocketknight1 @vasqu

[vasqu]

Auto dtype strikes again 👀

[vasqu]

run-slow: musicgen, perception_lm

[github-actions]

Workflow Run ⚙️

This comment contains run-slow, running the specified jobs:

models: ["models/musicgen", "models/perception_lm"]
quantizations: []

[github-actions]

CI Results

Workflow Run ⚙️

Commit Info

Context	Commit	Description
RUN	6a370326	workflow commit (merge commit)
PR	370441e5	branch commit (from PR)
main	70162852	base commit (on main)

Model CI Report

❌ 2 new failed tests from this PR 😭

• perception_lm:
  tests/models/perception_lm/test_modeling_perception_lm.py::PerceptionLMForConditionalGenerationIntegrationTest::test_small_model_integration_test (❌ ⟹ ❌)
  tests/models/perception_lm/test_modeling_perception_lm.py::PerceptionLMForConditionalGenerationIntegrationTest::test_small_model_integration_test_batched (❌ ⟹ ❌)

[Sai-Suraj-27]

Okay, The dtype mismatch issue is fixed but PerceptionLM is generating pretty weird output. Sorry couldn't test this before because this model requires some special access which I don't have.

[vasqu]

Let's revert the perceptron tests then and go with the musicgen fixes then, no worries. Looks like perceptron will need a deep investigation 👀

[Sai-Suraj-27]

Let's revert the perceptron tests then and go with the musicgen fixes then, no worries. Looks like perceptron will need a deep investigation 👀

Done. Will try to check the perception-lm failure later sometime.

[github-actions]

[For maintainers] Suggested jobs to run (before merge)

run-slow: musicgen