Refactor FalconMamba: replace class-name checks with generic attribute detection

[Copilot]

The codebase had hard-coded config.__class__.__name__ == "FalconMambaConfig" checks in three places in text_generation.py, tightly coupling Mamba-model handling to a single model class.

Changes

• Generic detection: Replace all config.__class__.__name__ == "FalconMambaConfig" guards with hasattr(config, "use_mambapy") — the attribute already cited in check_hasattr calls as the Mamba-model indicator, making the branches work for any Mamba-based config, not just FalconMambaConfig.
• Rename: _get_input_falcon_mamba → _get_input_mamba to reflect its model-agnostic role.
• Comment: Updated inline comment to clarify the pattern.

# Before
if config.__class__.__name__ == "FalconMambaConfig":
    ...

# After
if hasattr(config, "use_mambapy"):
    ...

Affected functions: reduce_model_config, get_inputs, random_input_kwargs.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Refactor FalconMamba</issue_title>
<issue_description>There are significant amount of codes specifically written for the model tiiuae/falcon-mamba-tiny-dev

if config.__class__.__name__ == "FalconMambaConfig":
    pass

onnx-diagnostic/onnx_diagnostic/tasks/text_generation.py

Line 30 in f86c55d

if config.__class__.__name__ == "FalconMambaConfig":

We should simplify/merge it to the main stream of code if possible.

cc @xadupre </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Refactor FalconMamba #228

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[xadupre]

unittest?