[serge] Fix 8 integration tests for model `falcon_mamba` failing with `output_mismatch` (other (6), list output differs
Author: sergereview[bot]
Pull request: yes

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## Original CI failure

- Failure group: `1/1: 8 integration tests for model `falcon_mamba` failing with `output_mismatch` (other (6), list output differs (2))`
- `tests/models/falcon_mamba/test_modeling_falcon_mamba.py::FalconMambaIntegrationTests::test_batched_generation` [multi-gpu] (output_mismatch, seen 6/7)

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Relates to #47120

Updates the expected generation strings in the `falcon_mamba` integration tests to match the current `tiiuae/falcon-mamba-7b` outputs observed in CI.

The shared `output_mismatch` failures across fp16/4bit/torch-compile/batched generation are caused by expected-value drift: the model now begins generation with "Hello today I am going to talk about..." / "Hello today I will be talking about..." instead of the previously recorded "Hello today Iava..." strings. This patch refreshes the `Expectations` entries and hardcoded assertions to the new actual outputs.

---
_This change was produced automatically by serge from a CI failure report. The patch was generated by an LLM and applied by serge; review before merging._

_serge `v0.1.0` · model: `moonshotai/Kimi-K2.7-Code` · 75 LLM turns · 80 tool calls · 263.1s · 1379134 in / 23159 out tokens_

Comments:
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_47124). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

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

run-slow: falcon_mamba

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### CI recap

**Dashboard:** [View test results in Grafana](https://transformers-ci.lor-e.huggingface.cool/d/pytest-observability-by-pr/pytest-observability-branch?var-pr=47124)
**Latest run:** [28846363499:1](https://github.com/huggingface/transformers/actions/runs/28908771190)
**Result:** `success` | **Jobs:** 5 | **Tests:** 337 | **Failures:** 0 | **Duration:** 2m 16s

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run-slow: falcon_mamba

[Workflow Run ⚙️](https://github.com/huggingface/transformers/actions/runs/29017783163)

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

models: ["models/falcon_mamba"]
quantizations: []

## CI Results
[Workflow Run ⚙️](https://github.com/huggingface/transformers/actions/runs/29017783163)

### Commit Info
| Context | Commit | Description |
|---------|--------|-------------|
| RUN | [c8379b86](https://github.com/huggingface/transformers/commit/c8379b86d11c472e8a90697b11fdf4fdfb6e6714) | workflow commit (merge commit) |
| PR | [b25c043b](https://github.com/huggingface/transformers/commit/b25c043b18bbf968de0d422303706333c1be8152) | branch commit (from PR) |
| main | [1293adfd](https://github.com/huggingface/transformers/commit/1293adfd29e2ed9107cb281b83c4f0b4a868a022) | base commit (on `main`) |

✅ No failing test specific to this PR 🎉 👏 !