[PYTHON][bugfix]Fix python model dict array generation

[ilayu-blip]

This fixes issue #23508
The approach that was taken is copying the 'python-pydantic-v1' model_generic approach .

"{{{name}}}": {
                _k: [{{{items.items.dataType}}}.from_dict(_item) for _item in _v] if _v is not None else None
                for _k, _v in obj["{{{baseName}}}"].items()
            }
            if obj.get("{{{baseName}}}") is not None
            else None{{^-last}},{{/-last}}

The main difference is that {{{name}}} was replaced with {{{baseName}}} because the key in the dict of the 'python' and 'python-fastapi' was baseName.

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@cbornet (2017/09) @tomplus (2018/10) @krjakbrjak (2023/02) @fa0311 (2023/10) @multani (2023/10)

---

Summary by cubic

Fixes incorrect codegen for Python models that deserialize dicts of arrays, aligning python and python-fastapi with python-pydantic-v1. Fixes #23508.

• Bug Fixes
  • Correctly generate from_dict for map[str, list[Model]] fields by iterating obj["baseName"] with a None guard and mapping each item via Model.from_dict.
  • Use the dict’s actual key (baseName) instead of the model name to match existing python/python-fastapi behavior.
  • Regenerated Python samples and added a minor .gitignore entry.

^{Written for commit 2151943. Summary will update on new commits.}

[cubic-dev-ai]

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