[serge] Fix 10 integration tests for model gemma3 failing with output_mismatch (list output differs (8), other (2))

[sergereview]

Original CI failure

• Failure group: 1/1: 10 integration tests for model gemma3failing withoutput_mismatch (list output differs (8), other (2))
• tests/models/gemma3/test_modeling_gemma3.py::Gemma3IntegrationTest::test_dynamic_sliding_window_is_default [multi-gpu] (output_mismatch, seen 6/7)

Relates to #47309

Fixes the test_dynamic_sliding_window_is_default failures in the Gemma3 integration group. The generation code from #40039 unsets cache_implementation="hybrid" so that models with sliding-window attention use the dynamic sliding-window cache by default. It was unsetting this value unconditionally, so an explicit cache_implementation="hybrid" passed to generate() was ignored and a DynamicCache containing DynamicSlidingWindowLayer layers was returned instead of the static hybrid cache.

The patch only unsets "hybrid" when it was not explicitly provided in generate() kwargs, preserving user intent.

Note: The normalizer failures (modeling_rules_doc, docstrings) are caused by a missing transformers.models.tipsv2 module / Tipsv2Config import, which is unrelated to this change.

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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 · 62 LLM turns · 62 tool calls · 194.5s · 2151228 in / 20968 out tokens

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CI recap

Dashboard: View test results in Grafana
Latest run: 29297459387:1
Result: success | Jobs: 15 | Tests: 171,053 | Failures: 0 | Duration: 14h 20m

[tarekziade]

run-slow: gemma3

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Workflow Run ⚙️

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

models: ["models/gemma3"]
quantizations: []

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CI Results

Workflow Run ⚙️

Commit Info

Context	Commit	Description
RUN	2ab07868	workflow commit (merge commit)
PR	c02bfb6c	branch commit (from PR)
main	e194978a	base commit (on main)

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